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!