Bluelab pH 4.0 Calibration Solution - 500ml

Reliable and accurate, this professional-grade solution is an essential tool for any grower looking to maintain the precision of their pH meters. Regular calibration is the secret to successful hydroponics, ensuring that your equipment provides dependable readings every time you test your nutrient solutions.

What's in the box
1 x Bluelab pH 4.0 Calibration Solution - 500ml