Hanna GroLine HI70004G pH 4.01 Buffer Sachets


HI70004G is a high quality pH 4.01 calibration buffer designed with hydroponics, aquaponics, and greenhouses in mind.

Single-use sachets are highly portable, with a small footprint and a lightweight design. They are the perfect accessory for your on-the-go testing, fitting easily into your pocket or carrying case.

  • Supplied with Certificate of Analysis.
  • Single-use sachets for convenience.
  • Perfect for use with GroLine testers and portable meters!

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HI70004G is a high quality pH 4.01 calibration buffer produced in accordance with ISO 3696/BS3978 standards using high purity salts, deionized water, certified weight-checked balances, and Class A glassware in a temperature controlled environment monitored with certified thermometers. Reported values are accurate to +/- 0.02 pH @ 25°C and are traceable to NIST Standard Reference Materials (SRMs).

Each sealed sachet holds just the right amount of solution making every sachet as fresh as the day it was packaged!

  • Solution does not contain any dyes that may stain the reference cell of a pH electrode.

Light block foil packaging

  • Light-tight packet helps to prevent against degradation by UV light.

One-time use sachet packets

  • Ensures quality and freshness of solution.

Each sachet marked with lot number and expiration date

  • Many Hanna solutions are specially formulated to have an expiration of 5 years from manufacture for an unopened sachet.



pH Value @25°C 4.01
pH Accuracy (@25ºC/77ºF) ±0.02 pH
Package sachet
Size 20 mL
Weight .1 kg
Dimensions 13 × 6 × 1 cm