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

Hanna Instruments Hi7004 1l Ph 4 01 Calibration Solution 1

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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KSh11760

Duties & taxes included

In stock

Sold byAmazon KenyaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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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.

Reviews

S**L

Should get if you need to calibrate ph machine reader

Helps calibrate the PH level because the machine I ordered wasn’t working after using this it was good, and price worthy

23.06.2025

R**S

Great product

I have used Hanna calibration buffer solutions for years with no problems.

27.03.2020

J**N

good ole' reliable

Works well it's reliable has a long shelf life. I've been using Hanna calibration solutions for years now and I have nothing but good to say and report about it

2.12.2016

F**A

Excellent ,,, meets my expectations

25.08.2020

A**R

Five Stars

Good product, would buy again. Make sure you get the 7.1 buffer for a two point calibration.

23.08.2017

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KSh11760

Duties & taxes included

In stock

Sold byAmazon KenyaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Kenya.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

View all Trustpilot reviews

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

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

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Common Questions