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Conductivity probes can be used for many different functions from letting you know the salinity of a tank to the quality of RODI water. We suggest calibrating conductivity probes once every 3-6 months to keep readings reliable.
447 mS Conductivity Solution - Used for calibrating conductivity probe for freshwater applications.
53.0 mS Conductivity Solution - Used for calibrating conductivity probe for saltwater applications.
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Didn't work out for me. By DG on 10/18/2016DG wouldn't recommend this product to a friendI used the 1 pack that came with the new apex. Couldn't get it to calibrate. It read 32.
Purchased a new packet. Still couldn't get a reliable reading after calibrating.
Thrid time I forgo the calibration fluid. I really like they Milwaukee electronic refractometer and trust it. So I got my tank water exactly where I wanted it using the Milwaukee then calibrated the probe to my tank itself. Now it reads what I expect it to read. I likely will not try calibration fluids again. Just calibrate to match my Milwaukee.