Is it normal for the ph of the buffer to change over time? My teika ph meter read 4.01 one day, 4.17 the next, and 4.27 the next.

I have the same problem and have not figured it out yet, even with a new meter. Sorry I couldn't be more help

Hi7004 1l Ph 4 01 Calibration Solution 1 L

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Description

🔬 Calibrate like a pro, measure like a boss.

LONG TERM READY - A 5-year unopened shelf life means your calibration solution is always ready when you are—no last-minute runs.
LAB GRADE PURITY - Formulated with high-purity salts and deionized water under strict ISO standards for uncompromising reliability.
PRECISION YOU CAN TRUST - NIST-traceable pH 4.01 calibration with ±0.01 accuracy at 25°C ensures your measurements never miss the mark.
SMART SECURE PACKAGING - Tamper-proof, airtight seal plus clear lot and expiration labeling guarantees freshness and traceability.
TEMPERATURE SAVVY CALIBRATION - Integrated temperature chart on the bottle lets you adjust pH values precisely across varying lab conditions.

The Hanna Instruments HI7004/1L pH 4.01 Calibration Solution is a premium, NIST-traceable buffer designed for precise pH meter calibration. Manufactured to ISO 3696/BS3978 standards with high-purity ingredients, it offers ±0.01 pH accuracy at 25°C, a 5-year unopened shelf life, and a tamper-proof seal. Its red dye and temperature chart enhance usability in laboratory and industrial settings, ensuring reliable, traceable calibration every time.

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A$61

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ASIN	B00RYPG6XE
Item model number	HI7004/1L
Manufacturer	Hanna Instruments
Package Dimensions	19.81 x 7.19 x 7.11 cm; 590 g

HI7004/1L pH 4.01 Calibration Solution (1 L)

Description

Specifications

Common Questions