Be confident in your purchase we're an Authorized Milwaukee Dealer. How cool is that?!?!? Features: Fast easy to read current results with large digital LCD readout. Accurate to 0.2 pH and 5 mV with the user selectable high/low set points. Simple two-point calibration for increased pH accuracy with manual trimmers for easy adjustment. Lab grade, gel-filled, double junction pH electrode and platinum ORP electrode included for low maintenance and high performance. 6.5 feet probe cables for extra flexibility when testing. 12 VDC power supply. Specs: pH Range: 0.00 - 14.00 pH ORP Range: 1000mV pH Resolution: 0.01 pH ORP Resolution: 1 mV pH Accuracy: 0.2 pH ORP Accuracy: 5 mV Set point pH: 4 to 8 pH Set point ORP: -200 to 600 mV Calibration: Manual 2 points pH | OPR Factory calibrated Alarm Active when reading is higher or lower than set point pH Dosing Contact 1 power plug for CO2 dosing ORP Dosing Contact 1 power plug for O3 dosing pH Electrode: MA911B/2 (included) ORP Electrode: MA921B/2 (included) Environment: 0 to 50C / 32 to 122F; max RH 95% Power Supply: 12 VDC adapter (included) Power Drivers: 115 VAC, 2A, 60Hz or 230 VAC, 1A, 50Hz Dimensions: 5.8 x 3.25 x 1.26 inches Weight: 7.1 ounces The Milwaukee MC125 PRO pH and ORP controller is designed for people looking to measure and adjust pH and ORP levels automatically with one simple controller. Just set your pH and ORP parameters and let the Milwaukee pH Controller do the rest. The Milwaukee PRO pH / ORP controller is preferred by people looking to dial in their testing program when they have an ongoing need to maintain levels. Common uses are nutrient tanks, aquariums, pools, and spas. The Milwaukee PRO pH / ORP controller offers: ACCURACY- The Milwaukee PRO 2 in 1 controller offers an accuracy to 0.2 pH with two point manual calibration and ORP accuracy to 5 mV. REAL-TIME MONITORING See real-time pH and ORP measurements from 0.00 pH to 14.00 pH and -1000 mV to 1000 mV with a large LED with easy switching between parameters. AUTOMATION FOR CONSTANT MEASUREMENT- The controller provides a control range of 4 to 8 pH and -200 to 600 mV. Just set your control range and the controller do the rest. TWO DEDICATED RELAYS FOR PH AND ORP CONTROL TO SUPPORT A RANGE OF COMPATIBLE DEVICES Choose your device including oxygen pumps, CO2-regulators, O3 ozonizers and other pH ORP control devices by simply plugging the device into the correct pH or ORP outlet. EASY INSTALLATION- The controller comes with a complete mounting kit including two probe holders.