MW802 are compact portable meters with faster micro processor. These meters allow you to measure pH, EC (conductivity) and TDS with just one instrument and one single probe! These easier and faster to calibrate portable meters have a smaller, ergonomic and lighter case design. Other features include 100 percent larger and easier to read LED Display and long battery life. Both meters calibrate manually in pH, Conductivity and TDS. Each meter is supplied with the MA850 interchangeable probe with 1 meter cable to measure pH, Conductivity and TDS. The pH electrode utilizes a fiber junction to reduce contamination when measuring fertilizer solutions. MW802 is supplied complete with MA850 combination pH/EC/TDS probe, 20 mL sachet pH 7.01 buffer solution, 20 mL 1413 microSiemens/cm sachet of calibration solution, 20 mL 1500 ppm sachet of calibration solution, 9V battery and instructions. Range: pH 0.0 to 14.0 pH / EC 0.00 to 6.00 milliSiemens/cm / TDS 0 to 4000 ppm. Resolution: pH 0.10 pH / EC 0.01 milliSiemens/cm / TDS 10 ppm. Accuracy at 20 degree C: pH +/-0.20 pH / EC/TDS +/-2 percent Full Scale. Calibration Solutions: M10007 (pH 7.01), M10442 (1500 ppm), M10031 (1413 microSiemens/cm). Conversion Factor: 0.68 Calibration: manual, at 1 point. Temperature Compensation: automatic, from 0 to 50 degree C. Probe: MA850 combination pH/EC/TDS probe. Environment: 0 to 50 degree C / 32 to 122 degree F; max RH 95 percent. Battery Type / Battery Life: 1 x 9 V alkaline / 150 hours of use. Auto-off after 8 minutes of non-use. Dimensions 185mm length by 82mm width by 45mm height.