Tests Assured 15-Pack pH Buffer Powder for pH Meters - Work with All Electronic pH Meters - Easy to Use- Water Testing Kit & Wide Range Application - Ensure Accuracy - Stable & pH calibration Solution

Works for my home brewing. I use it to create a PH solution (6.8) that I put in a small mason jar with the appropriate amount of distilled water. I keep it in the fridge in the dark for up to a year before making a new batch.I use this to test my mash PH (with a digital PH meter that must be calibrated before each brew) and pre-treat my water prior to brewing.Overall it's cheap, stores forever, and way cheaper than buying the liquid solution.

Use it, rinse with distilled water, and wipe with a paper towel every time you change solutions. You will contaminate it after the first 1to 3 dips. Don't save it! You aren't doing yourself any favors. Always a good idea to check against a good known meter.

I use this product to calibrate my pH meter. Works great.

I mis-calibrated with the packet that came with my ph meter; it was off by 1 which is a lot! So I'm glad I was able to get more packets and get it calibrated correctly.

This product works. You must use distilled water when testing. Follow instructions

Only got one of the blue packs. The rest were red and green.

Did the job in recalibrating my pH meter.

I like it all :)