pH Buffer Calibration Kit 2-Pack — 250 mL (8.4 fl oz) Bottle of Each: pH 4.00 and pH 7.00 | Color Coded

Quick shipping, well packaged, no complaints

I was able to quickly calibrate my test equipment and store it properly.

This stuff works well and helps me calibrate my ph meters.

I bought this to calibrate my handheld pH meter. These 2 are accurate but from what I can tell most meters need 3 different pH samples (basic, neutral abd acidic) to properly calibrate them. Maybe there are some devices that only use 2 but every one I've owned requires 3.

A calibration solution has a very simple task, remain stable at a specific target pH. The Biopharm buffers do this at half the price of the Hanna buffers they replaced.

Great PH calibration fluid. Works well with my blue lab PH tester pen!