Mineral Stones: Replace every 2 years

hydroponic grows

1 x Knob assembly

Value:  7

replaces in minutes

Milwaukee MA9065 111,800 uS/cm Conductivity Solution MA911B/2 Mineral Stones: Replace every 2Description The performance of conductivity probes are affected by use due to residue build up and aging. MA9065 is a lab grade 111,800 S cm conductivity solution standard prepared against a NIST traceable potassium chloride solution that allows you to recalibrate your conductivity meter or tester. Check your meter or tester's manual to find the correct calibration standard for your meter. Conductivity readings are effected by temperature. To help