... and low voltage display.Automatic identification of 13 pH standard calibration solutions, three options of standard ... waterproofPackage includes1. 201T-S Plastic pH Three-in-one Electrode2. pH Calibration Solution3. pH 4.00, 7.00, ... Features1. Special waterproof connector which four different electrodes (pH, ORP, Conductivity, DO) can be plugged into, ... only 3 to 5 minutes. Portable Digital PH/ORP Meter