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 (0.0 pH to 14.0 pH) with the user selectable high/low set points Simple two-point calibration for increased accuracy with manual trimmers for easy adjustment Gel-filled, double junction lab grade pH electrode for low maintenance and high performance 6.5 feet probe cables for extra flexibility when testing 12 VDC power supply Specs: Range: 0.0 - 14.0 pH Resolution: 0.1 pH Accuracy: 0.2 pH Set point: 5.5 to 9.5 pH Calibration: Manual 2 points Alarm Active when reading is higher or lower than set point Dosing Contact: 1 power plug for CO2 dosing pH electrode: MA911B/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 Mounting kit (Included) Dimensions: 5.9 x 3.2 x 1.35 inches Weight: 6.3 ounces (meter only) The MC122 controller automatically monitors and fine-tunes the pH levels. Just set your pH parameters and let the Milwaukee pH Controller do the rest. The Milwaukee PRO pH 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 and aquariums.