15 Pack PH Calibration Buffer Solution Powder Set, for Precise pH Meter Calibration, Make 250 ml of Each 4.00pH, 6.86pH, and 9.18pH to calibrate Your PH Tester

Works as advertised. Will buy again.

These are a must have to make accurate readings. Being able to buy in bulk is a plus since calibration is recommended frequently. They come in a small box which is great to keep them all in one place. Super easy to use.

Works well.

I make hot sauce and store them in bottles. I use these Calibration Buffer Solution Powder Set to measure its acidity level to keep my hot sauce fresh. I have used them many times and these powder sets haven't failed me yet. I like that it is clearly color-labeled for easy reading.

It's an easy to make buffer solution for pH meter calibration. Since it's a pre measure powder in a sealed packet you can make fresh buffer when needed.

Takes a while to break up and dissolve the product.. I suggest breaking it into a powder in the package since it's "caky" when furst opened.. but otherwise it is extremely accurate and gets my cheapo PH meter to perform like an expensive model..

Product worked as stated, I needed to re- calibrate my ph pens and they worked perfectly three stars are for the condition the box was in when I received it, it looked as if was old and used....

For as often I need to calibrate my pH testers this quantity of buffers is ideal.

I use them to calibrate my PH sensors. Make sure to use distilled water

In the field of forensics engineering, obtaining highly accurate data is critical. After all, this acquired data is evidence crucial in the determining the outcome of investigations. This means having accurate and dependable testing equipment at all times is an absolute must. This PH Calibration Buffer Solution Power is fundamental key to achieving this. Further, it is a valuable tool to maintaining the health of your PH testing device.

They work as advertised but I wish they offered them without the 9.18 packets as I don't use them. You only need the 6.86 and 4.00 to calibrate the meter for use in lower ph solutions so more of those packets in place of the 9.18 packets would make this product perfect.

THEY'RE EXACTLY AS LISTED AND WORKED PERFECTLY.

The buffers were easy to use and helped calibrate my pH meter simply and fast. The drop in a value star simply indicates that the buffer agent has minimal value itself, but the precise measurement, packaging, and certainly marketing, shipping, and reading my review count for most all. I am fully satisfied.