AI1108 pH Calibration Buffer Solution Kit for pH/ORP Electrodes, 4.00 & 7.00 pH, 4 oz & 8 oz

Another excellent product I like to use it as a backup or if I just want to doublecheck my charts thank you so very much

Had an older model Ph-80 that sat in a drawer for a year and had a dried out wick, Soaked it in the storage solution for 20 min cleaned it with distilled water calibrated first with 4.0 and it hit dead nuts then the 7.0 same thing. Fahrenheit was right at 67.0 degrees and I was happy I know these solutions are expensive and I don’t know why but it was the best deal on Amazon and it worked for me your mileage may vary but I had to give a positive review. The only thing I didn’t like is it was shipped in a Bag not an over Box for protection and I hate that for sure come on Amazon.

Ordered the calibration kit with the storage solution. The kit was shipped promptly, packed well and arrived in a couple days. Having the different colors in the liquids does make it easier to work with and less chance of making errors. There's plenty of solution for my needs to maintain a commercial pool monitoring system. The storage solution is also being used for my ORP probe. The pH 7.0 reference can also be used to validate my Taylor daily pool water test kit. The acidic solution came with an extra foil seal to prevent leakage... good idea. This order was for two, so I'm giving the other away as a "gift" to a friend in the industry.

Seems to be a good quality product

Price for quantity is good. Works as it should. Calibration fluid expires in under six months, storage fluid says ten months. That may be pretty standard for calibration fluids, idk. This is the first time I've ordered more. Hopefully with proper storage it'll last longer than the exp date.

Love appears, they are a good company that always pleases. They come with good in depth instructions and I will be purchasing more in the future, always on point.

I had borrowed a friend's pH meter and needed some calibration solution so I bought these. His meter was pretty old and flakey and I had to do a lot of calibrations. These solutions were easy to use and did the trick. I have since purchased an Apera meter which is so much better and way easier to use and also needs fewer calibrations. My bottles of calibration solution should last much longer now.

I primarily utilize my pH meter for brewing beer. I began to find that the measurements I was getting were way off of where they should have been. I did a calibration with the solution that came with my meter and my measurements were still off. I ordered the Apera cal solution and calibrated my meter using this solution and all of a sudden, my measurements were much closer (almost dead on) to where they needed to be. This cal solution is great and I love that it also comes with storage solution. I will always return to Apera when I need more cal solution .

No issues. As expected. Storage solution is a nice addition. Tested against freshly cal'd unit and spot on.

Well packaged and excellent price.

All lids not tightened. Storage solution lid really loose; seal broken causing liquid to escape and run down the bottle, crystallizing around mouth and down sides. Noticeably lower liquid volume in bottle.

They arrived half frozen. Full of slush but the purchase and delivery went smoothly.