Adjustable 4-20mA Signal Generator Current Voltage Analog Simulator 0-10V/0-22mA Signal Sources for Value Adjusting PLC Controller Panel LED Testing Calibration

SImple to use. Battery was charged when I received so I was able to play with it right away. Also has capability to run off 24VDC power or USB adapter (comes w/cord but you'll need the USB power supply/phone charger) Good value; I'm not looking for a calibration quality device so it fit my needs. I will be using it as a 4-20mA source. It outputs at 24VDC in the mA generator mode. It was accurate enough for what I will be using it, mainly troubleshooting or modeling. I don't need to be highly precise. I noticed the signal bounced somewhat, but it was in the magnitude of .01's. This difference just as well could be from the precision of the controller/PLC that I was connected to. Comes with a USB power cord and little tweaker screwdriver. Nice to have when you are working in the field.

This is awesome for testing systems. It's small and light as well, so easy to carry with commissioning tools. Great price as well. I don't need it for calibration, just to similate and trouble-shooting.

Works reasonably well. Bought 8 of these for testing analog inputs on panels. Like the ability to simulate both passive and active 4-20 ma circuits and the adjustable knob rate. Battery lasts 30 - 60 minutes in the modes we use them in. We use these with a USB power strip and just plug them all in. USB cords that ship with the units are short, ordered longer ones. Devices tend to lock up every couple of days, just power cycle them to clear. Instructions aren't clear but what else is new. Not too hard to figure out.

I haven't spent time to look at its stability or noise, but this little gadget does a lot for the price. I am primarily using it as a DC voltage source over a +/-10V range for testing/debugging electronics. I'm not using the 4-20mA function (presently). It has 10mV of resolution as a voltage source. But it comes with an internal rechargeable battery....Lithium ion battery ( I think) a USB port , plus USB cable, to charge the device. The knob will twiddle a "selectable" 100mV digit or 10mV digit.... fairly easy to configure, but not intuitive. You need to reference instructions. You can also configure more behind the scene settings with the knob (voltage range for example). Even less intuitive....it requires a password. Don't toss the instructions. I think it would have been more slick to have two push buttons left/right direction ... left/ right to select a digit...which gets "highlighted"...either by flashing the digit or extra brightness on the selected digit when in edit mode. Then the knob could twiddle the selected digit up and down. What is the price of two extra left right push buttons. :-) I measured its out-of-the-box accuracy and it was pretty close.....off by ~200uV of "offset" in the negative direction...its linearity was pretty good....+/-1V was off by less than 1mV, +/-10V was off by less than 10mV....so mine had sub +/-0.1% kind of accuracy with a 200uV floor. If I see any quirks, I'll update my review, but don't think I would expect more for the price. It delivers. I have promptly put in an order for a second device, just to have one around while the other may be charging.

Great product for price. Used it to drive the actuator open on a suction valve. And you can use it with the charging port plugged in!

What a great device. I was very pleasantly surprised

Working in the building automation industry, this is an inexpensive and reliable signal generator to make field testing of actuators very easy. I recommend this to co-workers, as it saves time over simulating signals from the control system.

Unit appears to work, but I am unable to figure out how to set it for "Pulses" for stroboscope or how to set it for adjusting the frequency of output - Ie: Use knob to adjust the Frequency per minute for flashrate of the stroboscope. Like from 30 - 200 pulses per minute to get 30 - 200 Flashes per Minute using the knob. Instructions are not clear on how to do the setting. Unit appears to be a good and nice product.

Very small and compact design, look is very good, Ratating knob is very smooth functioning, Display is good with bright LED, Stand alone battey, Charger 3 ways, very portable.

Very good product with built in battery which makes it very portable. I can move it to where I need to generate a 4-20mA signal easily. And also used for give the 0-10 V