Nutri + Florasol 4.0 pH Calibration Solution, 500 ml

Calibration solution for pH-meters. A monthly calibration of your equipment is essential to obtain precise results but we suggest calibrating even more frequently. Consider testing and calibrating your devices every week. 

It is also suggested to calibrate with both the 4.0 and 7.0 calibration liquids to dial in your meter perfectly. This two point testing ensures the highest accuracy.