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 5 mV with the user selectable high/low set points Gel-filled, double junction lab grade Platinum ORP electrode for low maintenance and high performance included 6.5 feet probe cables for extra flexibility when testing 12 VDC power supply Specs: Range: 1000 mV Resolution: 1 mV Accuracy: 5 mV Calibration: Factory checked Set Point Range: 0 - 600 mV with alarm active when reading is higher or lower than set point Dosing Contact: 1 power plug for O3 dosing Electrode: Double Junction MA921B/2 Probe (included) Environment: 0 - 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 3.2 x 1.3 inches Weight: 6.3 ounces (meter only)5 x 1.26 inches Weight: 7.1 ounces The Milwaukee PRO digital Redox ORP controller automatically monitors and fine-tunes ORP levels. Just set your ORP parameters and let the Milwaukee ORP Controller do the rest. The Milwaukee PRO digital 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 aquariums, swimming pools and spas, and other water quality monitoring uses. The Milwaukee PRO ORP controller offers: ACCURACY: The Milwaukee PRO ORP controller is accurate 5 mV. AUTOMATION: The controller provides a control range of 1000 mV with a user selectable set point with a range of 0 - 600 mV and a visual "Power Activated" LED light. COMPATIBLE DOSING PUMP: Milwaukee includes a 12 VDC power plug socket compatible with Ozone Dosing units. EASY INSTALLATION: The ORP Controller comes with a complete mounting kit including a probe holder.