This new water quality monitor is professional and necessary tool for testing ORP / PH / Temperature / EC / CF / RH / TDS of the solution level. Suitable for aquarium pool, laboratory, and environment water. Features: Widely used to measure the ORP / pH / RH / Temperature / Conductivity EC / CF / TDS(PPM) of solution/water. Imported IC and high cost performance. Test temperature in ℃ / ℉(switchable unit). Easy calibration of pH and TDS with just a mini-screwdriver. Can online monitoring for a long time. Can work continuously more than 10 hours of power outage or outdoor without power after charging the battery for 3 hours. FCC certificated to offer safer and preciser measurement. Clear LCD with backlight, 3 results displayed simultaneously. Apply in water sources, aquarium, hydroponics, laboratory, spas, swimming pools and other water systems. Automatic temperature compensation. Easy to use and provides instant display of results. Specifications: Range: pH: 0.00 ～ 14.00pH      ORP: -1999mV ～ 1999mV      RH: 10%RH ～ 99%RH      Temperature: -50℃ ～ 70℃ (-58℉ ～ 158℉)      EC: 0.00 ～ 19.99EC        CF: 0.0 ～ 199.9CF       TDS: 10 ～ 19990ppm Resolution: pH: 0.01pH          ORP: 1mV         RH: 1%RH          Temperature:0.1℃(0.2℉)         EC: 0.01EC            CF: 0.1CF            TDS: 10ppm Accuracy: pH: ±0.1pH        ORP: ±5mV        RH: 5%RH         Temperature: ±1℃(±2℉)           EC、CF、TDS: ±2%F.S Temperature Compensation: 0℃ ～ 50℃ (32℉ ～ 122℉) Working temperature: 0℃ ～ 50℃ (32℉ ～ 122℉)  Power supply:  DC  6V (Power Adapter Usable) Battery: 2 * NI-MH  4.8V Battery （Included） Color: Black Material: ABS Plug Type: EU / US (Optional) Input Voltage: 100～240V   Item Size: 152 * 80 * 26mm / 6.0 * 3.1 * 1.0in (Excluding Conductivity Probe) Item Weight: 229g / 8.1oz (7 in 1 Meter Body) Package Size: 23.5 * 16 * 6cm / 9.3 * 6.3 * 2.4in Package Weight: 669.5g / 23.6oz Package List: 1 * 7 in 1 Water Quality Monitor with Conductivity Electrode 1 * User Manual 1 * pH Electrode  1 * ORP Electrode 1 * Temperature Electrode 1 * AC-DC Adapter 2 * Suction Cups 1 * Bracket 1 * Mini Screwdriver