Smart Blue Tooth Dissolved Oxygen Meter 0.0-30.0 mg/L Digital Online Detector High Precision Electrode Tester for Hydroponics Product Description: 1,Dissolved oxygen refers to the concentration of molecular ... Read More
YIERYI Digital ORP Tester electrical 0-1999mg/LmV ORP Meter ORP-986 Water Hydroponics Specifications: Range 0~1999mg/LmV Resolution 1mV Accuracy 5 mV Batteries 4 x 1.5V alkaline Environment 0 to 50C,RH 95% max ... Read More