Review on 🌱 Bluelab PENSOILPH - Soil pH Pen, Digital Meter, and Water Test Kit | Ideal for Coco, Rockwool & Hydroponic Systems | Easy Calibration | Indoor Plant Growth | Clear by Fisseha Rodgers

block, does not want to calibrate. Soak the probe in the storage solution for 24 hours. The probe is not calibrated. Contacted Blue Lab, they said to return it. How good it is for me to be able to sing and dance the RETURN song because they sent me a broken product. If you lived as far from a UPS office as I do, you wouldn't want to return either. Replacement has arrived. It is correctly calibrated and delivered reproducible results in 14 test areas. You will need a calibration solution for the two pH test points and a solution to store the pH sensor.