Description
CALIBRATION SOLUTIONS FOR APEX SYSTEM pH Calibration 4, 7 and 10 Standards. Select the 7 & 10 standards to calibrate a pH probe for a Saltwater Aquarium Select the 4 & 7 standards to calibrate a pH probe for Freshwater Aquarium or a Calcium Reactor Conductivity Calibration Solution, 53.0 mS (salinity) 53000 µS Conductivity Calibration Solution Use it to calibrating conductivity probe for saltwater applications. Calibrating conductivity probes once every 3-6 months to keep readings reliable
