📐 Accurate Calibration with Milwaukee Instruments MC122US Controller Review

I had an old model (ugly green/yellow) of this gauge that I bought many years ago. It still works, but the new black and green (instead of the beige shown here) looks too cool to pass up. An advantage is that this new model is easier to calibrate, with a pH indicator and 4 and 7 screws on the front. Milwaukee is a reliable company in my experience.

First impressions are that this is a really great tool. It was clear how to set it up and it works as expected. The pH values were consistent with other devices and the switch to turn the devices on and off worked as expected. I use it to power the solenoid of my CO2 system in my aquarium. I love that the power management output is separate from the unit, so I can run a timer either on the unit or on a separate power plug (which means I can lock out the time the unit is reading pH levels…

I bought this to easily check the PH levels in my hydroponic system instead of pulling out a test kit and taking samples multiple times a day. Day. It worked so well just for monitoring that I decided to get a pump to automatically raise or lower the pH. You can only pick one, but I've found my system likes to go below 5.9, so I mostly use ph up to keep it between 6.0 and 6.2. However, I did not use the $80 Milwaukee pump. I bought a regular pump for $12 and used an old cell phone charger for…