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

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Hanna Instruments HI7004L 4.01 pH Calibration Buffer Solution, 500mL Bottle

Product ID: 13710562

⏳Long shelf life, stable formula

🧪500mL lab-grade buffer solution

⚖️Precise 4.01 pH calibration

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7952 som

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Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🧪 Calibrate like a pro — never second-guess your pH readings again!

RELIABLE STABILITY - Formulated for long-lasting shelf life, ensuring consistent performance every time.
LAB GRADE PRECISION - Calibrate your pH meter with industry-trusted 4.01 buffer for flawless accuracy.
GENEROUS 500 M L VOLUME - Ample solution to keep your equipment perfectly tuned over multiple uses.
EFFORTLESS CALIBRATION - Simplify your workflow with a ready-to-use solution that guarantees quick, accurate results.
TRUSTED BY PROFESSIONALS - Hanna Instruments’ legacy means dependable quality you can count on.

The Hanna Instruments HI7004L is a 500mL 4.01 pH calibration buffer solution designed for precise and reliable calibration of pH meters. Trusted by professionals, it offers a stable formula with a long shelf life, ensuring consistent accuracy and ease of use in laboratory and industrial settings.

Specifications

ASIN	B00RYPG6XE
Best Sellers Rank	#73,053 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #35 in Chemical Buffers
Date First Available	January 8, 2015
Is Discontinued By Manufacturer	No
Item Weight	1.3 pounds
Item model number	HI7004/1L
Manufacturer	Hanna Instruments
Package Dimensions	7.8 x 2.83 x 2.8 inches

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