Hanna GroLine pH 7.01 Calibration Buffer — 500 mL

pH 7.01 is the neutral calibration point every pH meter starts from — the offset point used to anchor an accurate one- or two-point calibration. This 500 mL bottle of GroLine buffer is the economical size for growers who calibrate often.

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.