Bluetooth Compatible Thermometer, Hygrometer & Dew Point Sensor and Logger, Smart Temperature Humidity Monitor, Unlimited Phone Storage. Simple Data Export. Made in USA

This sensor is very impressive! Our requirement was to interface our existing mobile app with temperature monitoring hardware. After a lot of research, we found TempoDisc In our case these features make BlueMaestro TempoDisc stand out: * Low energy Bluetooth: BT was definitely in our requirements, and there are other sensors out there that have a BT interface. TempoDisc was different in the fact that its Low Energy Bluetooth interface allows for a unique combination of size, battery life and functionality. * Logging: The ability to not only save historic temperature records but also to configure the frequency of the recording allows us the flexibility to configure the sensor for all of our use cases * Replaceable battery: You don't need to throw away and waste your hardware when the battery runs out. Battery replacement is simple cost efficient. * Resistance to condensation: We need to use these sensors inside a fridge, TempoDisc internal boards have a special coating that protects them from condensation. * They have a well documented and 'open' API: Out of the available hardware that we found, this was the only sensor that had any online API documentation and an example SDK. It only took a few hours to interface it directly to our mobile app (for most people this may not be that important a requirement as TempoDisc comes with it's own mobile app) * Low cost and Quality -> Very competitive price for the offered functionality and appear to be good quality.

My husband is using this device to monitor the humidity levels in the case where he keeps his favorite guitar. This device is straightforward and high quality. It helps him to know exactly the right time when he needs to add water to the humidifier so that the humidity does not drop below a certain level which helps to prevent the guitar from drying out and cracking. Since the value of the guitar is over $3000 it’s easy to justify the investment in buying this device. The app is very user friendly. I am not tech savvy and still found every aspect about this product simple yet cutting edge. The people who invented this definitely know what they are doing. Keep up the good work.

Poor quality. Got a second one in 10/24 and just like the 1st, it failed (8/25). Worked fine and one day it's telling me it's -35. Even resetting it didn't correct the defect.

The Short: I have one of these data loggers to monitor the humidity in each of my guitar cases and they work well. It is easy to read the humidity in all cases at once with app, they have long battery life, they are small and can be tossed into the storage compartment, and seem to be accurate when compared with my reference hygrometer. That is all I really need to say. The Long: I use the BlueMaestro Tempo Disc™ Bluetooth Temperature, Humidity and Dew Point Sensor Beacon and Data Logger wireless devices to monitor the humidity inside my guitar cases. All of my instruments have humidity control packs inside the case and as long as I keep the humidity packs in shape I have not had to worry about the humidity inside the case. However, I have kept a digital hygrometer in one case just as a reference along with a hygrometer in the room. The case digital hygrometer broke and while looking to replace it I ran across these Tempo Discs data logger that had temperature, humidity, and dew point. I purchased one about a year ago and tossed it into the storage compartment and it has just been working away without any effort from me. Two nice features I really enjoyed about the device is that I do not have to open the case to get the humidity reading and it has a trend so I can see the high and low humidity readings and note that if the humidity is trending downward it may soon be time to refresh the humidity pack. The system of one hygrometer and multiple cases worked well for a long time. However, I don’t play as often as I used to and would occasionally find that I let my humidity packs go dry. Also, my guitars now reside in multiple places and I loan a few of them out. I have purchased additional devices and now have one Blue Tempo in each case in the storage compartment and I can check the humidity of all the guitars in the same building (specs say 220 feet) with a quick view on my smart phone. Also, if I loan one out I can instruct the person to use the app to keep an eye on the humidity. My latest devices came nicely packed wrapped in plastic, placed in a nice tin, placed in a velvet like pouch, all within in a cardboard pouch. A big and welcome change since my first one over a year ago. In addition, the tin is a nice size to store picks and the pouch for other small things such as capos, thumb picks, batteries. If you don’t have a storage compartment, toss the device in the velvet bag and keep inside the case. The devices are plastic and should not ding any wood, but having them in the velvet case adds another layer of protection. The devices are about the size of four quarters (USA) and claims to run one year on a CR2032 battery. I have not had my devices long enough to get a good idea of battery life, but it is nice the app shows the battery life of the device. They devices are small and do not have GPS so don’t misplace them. With the app, you can at least tell if you are within 200 feet - if you left the device on. The devices are ready to go, just pull the tab on the device that protects the battery from being in contact and turn it on. There is a push button on/off that is nice if you are not going to use the device for a while. Download the app for your smartphone, bring up the app, and like magic, they all appear. There is no setup needed. So far, no calibration has been needed, they all pretty much match my reference hygrometer (with 0.5%). The logging interval is user defined from 1 minute to 18 hours and I have found a recording period of 15 minutes works well and provides a nice trend. I also named each device the guitar make/model so I know which device is in which guitar. Note the name and any calibration is stored on your smart phone or tablet - not internal to the device. For my loaners, the person only has one guitar so a device name is not important. Please note that you do need to read the data with the Blue Tempo app, these are not push devices and they do not send to your smart phone. Blue Maestro does offer a internet gateway that connects with your internet router via WiFi and Blue Maestro sensors using Bluetooth and forwards sensor data over the internet to the Blue Maestro Cloud where it can be accessed anywhere. I have not tried this type of access and for my occasional monitoring remote access is not a problem for me since I am generally in the same building. The application is available for both for both IOS and Android. The app does great job of picking up the signal and displaying realtime information. You can view all of your devices at once along with the current readings and status such as battery level, log count and logging interval and there is no limit to how many devices you can monitor at once. With a few clicks, you can get the history from any device, up to 6000 points, and display charts of temperature, humidity, dew point, and pressure (device dependent). With the graphs you can choose the period to show at the push of a button and quickly scan through the graph's timeline. Each metric measured by the device is graphed both separately and on a combined graph including temperature, humidity, and dew point for comparison purposes. The data also includes high, low, and average readings. You can also export a ‘ csv' file of the log data to a email address or to the cloud. The only time I did this was to compare devices stored in the guitar case storage compartment, in the case itself, and a reference data outside the case. Just for information, I found very little difference if the device in the storage compartment or just in the case. I don’t measure the inside of the guitar since that is where my humidity packs live. The app also lets you set the device name and humidity and temperature calibrations. Again, do note that these are stored with your smartphone or tablet. Be sure to get the latest version of Blue Tempo 2 for your mobil device. You might also try to get the Blue Tempo Utility since it has additional features. Customer service has been really great. There was a reading issue with my first one and they immediately replaced it. They seem to update the app on a regular basis and the app gets better with each generation. Any email correspondence has been quickly addressed and they are open to suggestions and recommendations. Blue Maestro offers a wide range of sensing and logging solutions. Look them up on the internet and see what is available. They offer cloud monitoring solutions and are open source and can provide SDKs and APIs to design your own mobile apps or integrate the devices into third party systems. Pros Easy to connect to device, no setup required. Easy to adjust data collection interval Quick to read multiple devices at the same time Small and lightweight Quick to respond to temperature and humidity changes. Have on/off button and airplane mode Great customer service Wishes Save name and calibration on the device and not on your smart phone or tablet. You can select temperature units (C or F) but it would be nice to have the ability to select barometric units if the device monitors pressure. Sometime on the tablet the trend does not take up the full display in landscape mode. This issue seems to go away when you get a few thousand data points. Built in GPS - well, not really but it might be handy when you misplace a device. So now all I need is more guitars...

I have had years worth of electronics for just giving me weather data for my comfort, and for my plants in winter. But this is the FIRST unit I have found which will provide this information and build it into live charts on my smartphone! I was excited to receive it, and it looked like it had the potential to be the do-all be-all for me. And it does, but to me, it was marketed prematurely. The instructions, available on line have hot been sufficiently honed to show that this little thing CAN be the DO-ALL, BE-ALL it was designed to be. The manufacturer has bent over backwards to work on simplifying the instructions. The unit itself does exactly what I want, plus myriad similar functions. So many functions that they get in the way of understanding the simpler ones. It DOES give me minute by minute charts of the temperature, relative humidity and dew points that is to die for! If you are willing to let it do its little job and can tolerate imperfection in the instructions, I say get one NOW! You’ll be way ahead of the crowd. The manufacturer, a small group of REAL people, is earnestly working to simplify the instructions, and you’ll get the updates as they are issued. Your money will not go to waste. The little thing is utterly amazing! It can take your breath away! It is about the size of four USA 25-cent coins stacked together. It runs most of a year on one nickel-sized battery. If you have crows in your area, tack it down, as it has eye-appeal to these guys! Mount it where it is out of direct sun and protected from rain. It takes minutes to get it running, and you will have a great feeling of being up to date on your porch weather! It is sure to start a trend- Just Watch!!

Pros: The device is pretty accurate, and the small size is nice. The app could have some more features, but overall the software is fine. The range is pretty good too, I can connect to the device located in my basement on the 2nd story of my home, I can't download reports from that far, but it has the best range out of all of my bluetooth devices. Cons: Absolutely chews through batteries *if* you leave it connected to the app. And it's a huge PITA to change out the batteries. My experience: I bought this to monitor the temp in in a reptile enclosure, where I have it linked to a tablet that the device is constantly linked to so I can view it at anytime. I've had to replace the batteries 3 times in 3 months, or once a month compared to the once a year that's advertised. I figured this would take a hit on battery life, but the loss in life is ridiculous. This wouldn't be so bad if they didn't use the worlds smallest screws (why do you even need screws???) to hold the back on. Also the battery life indicator in the app is useless, my batteries have all died between 100% - 80% according to the app. Final thoughts: I was planning on buying a few of these to monitor different areas in the reptile enclosure, and I have since decided to look for something else. If you want something to update infrequently and hold logs, it's fantastic. If you're wanting something that constantly updates, this is not the product for you.

I use these to monitor my beehives (the photo attached is from setup of my new one - not the inside of my beehive!). Depending on where I place them, the bees eventually cover them in propolis and kill them (because that's what bees do). Even with the bees trying to kill them, they've each lasted about a year. I've had one that survived the bees long enough for the battery to die and it was easy to replace. The last one I got had a calibration issue, and their customer service got me a resolution as soon as I messaged them. I'll keep buying them because they work. I've seen people complain about signal range. I guess it depends on how you place the device. My back door is about 40 feet from my closest hive and now that I've learned to not block the signal with 20 pounds of bees (I place the monitor on the closest corner to the house now) I can pick up the signal from there. On a good day, I can get signal from inside the closest corner of the house, and if it's obscenely cold (as Colorado is known to be sometimes), I'll have to take a couple of steps outside to pick up the signal. Like I said, they've all worked fine for me so I'll keep buying them as needed.

I've been using this sensor for about 2 years now to monitor temp and humidity levels in my ball python's habitat. Overall it's just ok. It's accurate enough within 1-3 degree F of a probed digital thermometer and within 5% of another hydrometer. It's held up well even in the hot humid conditions of a terrarium. The battery life is average and the batteries are cheap and easy to replace if you have a small electronics screw driver set. The problems I have with it really lie with the app and user interface. The app is clunky. The data is recorded and presented poorly. The connectivity is also lacking. The sensor has a tendency to disappear and need refound/scaned all the time to establish the connection. Once found and connected the current values are accurate and accessible enough. However everything else with the app is a mess. The date and time settings constantly reset. Ive grown tired of fixing them so I just accept that the recorded dates are going to be wrong. The high and lows also reset for no reason or read errors like -6,000F or 1200% humidity. You have to download the data to view it in graph form which constantly fails for me. The graphs themselves are pretty poor. The default view is along the 0 x axis so you cant really see your data unless you scroll and adjust the view every time. When you just want a quick look at you data for say the last month this becomes annoying. Also the whole thing is likely to reset randomly and dump all your data anyway. It a month goes by without it resetting I'm lucky. Overall this sensor is a hard pass. Ive been working with the sensor push sensor for about 2 years aswell. Its a much better option with none of these issues. Also available on amazon for about the same price.

Update to my earlier review: I've now had the sensor for over a year and recently had to replace the battery. The screws are so small that my smallest Phillips screwdriver didn't quite fit. In the process of trying I stripped the heads and ended up damaging the disc's back cover. I contacted Blue Maestro's customer support and Kirstin sent me new screws and a new back, all free of charge! I now have the correct size screwdriver (Phillips #00) and managed to change the battery no problem with the supplied new back and screws. Great service! Original review: I wanted a temperature gauge which could log the temperature to my smartphone for when I'm camping or hiking. I got my Tempo Disc a couple of months ago now and it's a great little gadget. It's really quite small and weighs next to nothing. I've calibrated it against a couple of other thermometers and it seems to be quite accurate. To get a correct reading the temperature sensor can't be kept on the person. This means the sensor has to be robust and weather resistant enough to be hung from a backpack, as shown, or live in one of the side pockets. The Tempo disc appears to meet all the requirements. Especially with the little gel case shown in the photos, which is sold separately on the company BlueMaestro's own site. (It's a shame they don't sell it as a bundle option on Amazon.) On the company's site they also have a key hanger version of the sensor but that includes a pressure sensor and since my phone already has one of those I did not need that. The staff at BlueMaestro were very helpful and friendly when I ordered the little gel case. I've now had the sensor with me on quite a number of outings and it works really well. The readings appear on the app on the phone with no problem and the app also gives you a high and low for the last 24 hours which is nice. You have to make sure it is out of direct sunlight so I mostly have it one of the mesh side pockets of the pack. This ensures plenty of air flow and accurate readings. So far it has withstood a couple of very wet days without any issues. It isn't sold as waterproof but it seems to be able to withstand very humid conditions, 85.1% according to its own reading, without any problem. The temperature logs can be downloaded from the sensor into a spreadsheet and so I now have accurate temperature charts to go with the other data from our hikes and treks. Combined with photos, maps, and notes they make for a very useful record of what things were like. Lastly, the way it is all packaged deserves a mention. The sensor itself is very well protected in a metal case. There's a full paper manual and download instructions for the app. I also love the fact that they give away Haribo sweets with it.

This is a neat little device only let down by the instructions it arrives with. I imagine a lot of people would be fazed by the lack of even a bit of paper. and only a website address. It's about the diameter of a 50p piece and comes in a small metal box. The reference to bluemaestro.com is on the bottom of the box. The 'Tempo Utility' app is available on both Andoid and iOS app stores and functionally they're similar, but the graphing on the iOS app is better. The x-axis shows date and time on the iOS app, but only data points on the Android app . As an Android user this is something that needs to be corrected ASAP. Using the app you can setup the device to log data at any interval from once a minute to once every 12 hours. Independently of the logging interval you can also adjust the sampling interval, i.e. it can sample and broadcast the data every minute, but it might only store a data point once an hour. The disc broadcasts the temperature and humidity in it's bluetooth 'advertising' signal so the current data can be picked up immediately using the app at anytime.The bluetooth range is much the same as any bluetooth device and in my case doesn't travel too far through the house. The disc stores all its logged data and this can be downloaded into the app to get a table of values or a graph. It's then easy to email a CSV file of the data. I had thought that the disc needed to be in 'pairing' mode to download the data, but it turns out that it's possible to download the data at anytime without touching the disc. This is clearly a powerful little device that could be used in many ways. Once understood it's very good and I've bought another to monitor another part of the house.

Having messed around with IoT sensors in a DIY manner I wanted to try one of these devices as a ready to go environmental data logger. As you can see from the photos it arrived very smartly packaged and the Haribo was a nice touch. I downloaded the Tempo Plus 2 app, pressed the blue button on the sensor, hit Scan in the app and the current sensor readings appeared straight away, along with a reassuring 100% battery life indicator. With one click the data log is downloaded to the app, and from there some nice, zoomable charts can be viewed, or the log emailed directly as csv or uploaded to a cloud account. The cloud account dashboard itself allows the same charts and export as csv, for easy charting in Excel (I had to google how to convert the log entry unix timestamps into friendly date time strings). Compared to a DIY solution this is a very small, unobtrusive device that with its long battery life can be placed and forgotten about - just connect from the app when within range and grab the latest data set (it will roll over so set the logging interval accordingly). The company also offers a Pi-based hub, Tempo Anywhere, that will automate updates from local sensors to the cloud, over wifi. I'm looking now into getting the data directly from the device for other integration.

I have 2 of these little devices. I bought the first one 3 years ago and based on its excellent performance, I bought another about 2 years ago. They are both still functioning well. I use one to monitor the temperature of my worm farm and I download charts of max and min temperatures and humidity during the week or month. Very easy to set up and use. Also great customer support, which I have needed to call on a couple of times. Highly recommended.

I would just like to say that the customer service with blue maestro is phenomenally good. I ordered this device, and I had a few problems getting it to work. I called their support line, and within a few minutes had Kirstin, the co-leader/product designer assisting me. We figured out that it was a battery connectivity issue (one of the pins was loose, and required help to make the battery sit correctly). However, in addition to helping fix the issue, she proactively shipped me a brand new one in case the fix didn’t work. If I could give 10 stars I would, and it’s really nice to have a quality sensor, not a cheap made in china one.