Review on Precision Hydroponics Test & Measure Instrumentation for Accurate Aquarium and Substance Analysis by Adam Tidd
Not calibrated: pH meter
I liked the first cheap model that replaced this one. The old one had an included screwdriver that you used to adjust the pH to a solution. The new model - the first lasted a year, but the calibration was constantly lost with everyday use. This is not calibrated upon arrival. The electrodes are broken.
- analytical instruments
- weak
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