Hanna GroLine pH 7.01 Calibration Buffer — 1 Gallon

The workhorse size for rooms that calibrate daily. pH 7.01 is the neutral calibration point every pH meter starts from — this 1-gallon jug of GroLine buffer keeps the calibration station stocked at the lowest cost per calibration.

Hanna calibration buffers are prepared to precise formulas and standardized against NIST-traceable reference standards, so your meter reads true every time you calibrate. Each container is airtight with a tamper-proof seal, and the lot number and expiration date are printed on the label. Unopened, Hanna buffers carry a 5-year shelf life.