KL-803 is a European plug without WiFi function KL-803W, the monitoring software is Android system, currently there is no Apple terminal, please pay attention. KL-803W, wifi monitoring digital acid-base and redox controller. This is with wireless wifi function, you can monitor data in real time on the mobile APP. The product is an optional plug for European and American regulations, and backlight or backlight is optional. Model: PH-803 Display type: number Display: Dual 4 LEDs, dual display readings Type: Dual aquarium controller for pH and ORP Measuring range (ORP): -1999~1999mV Measuring range (pH): 0.00~14.00pH Power consumption: 2 watts Probe: replaceable Digital pH ORP Redox 2 in 1 Controller Display: dual 4 LEDs, dual display readings Conformity: CE and RoHs Measuring range: PH value: 0.00~14.00pH ORP: -1999~1999mV accuracy: PH value: ±0.1%+ 0.02PH ORP: ±5mV Resolution: PH value: 0.01pH ORP: 1mV Predetermined area: PH value: 3.50~10.50pH ORP: -500~500mV Relay contact: AC 110V or 220V is 5A working environment: Operating temperature: 0 to 50°C (32 to 122°F) Environmental humidity: 90 or less than 90% R.H. Power requirements: AC110V±1060Hz / AC220V±1050Hz Power consumption: 2 watts Voltage: 110V or 220V Dimensions: 160 x 102 x 40mm Weight: 1400 grams Simultaneously measure and display pH value and redox value (ORP) It comes with 2 BNC electrodes (pH and redox) and 2 output power sockets. Both electrodes are detachable and can be easily replaced at any time. As for the relay output power socket, you can plug your own 110V/220V equipment into it, such as air outlet stones, O3 ozone generator, oxygen pump, CO2 regulator, solenoid valve and other ORP pH control equipment. Just set the required high/low pH/redox value in the controller. If the currently measured pH or redox value is lower than the set value, it will turn on the device; if the measured value is higher than the set value, it will turn off the device. Application and purpose: You can pay close attention to different water quality parameters in the water tank in this way There must be a perfect way to automate and adjust the control equipment in the aquarium to eliminate lethality and maintain a healthy water system Packing list: 1 dual aquarium controller for pH and ORP (110V or 220V provided) 1 x detachable 300cm pH electrode 1 x detachable 300cm ORP electrode 2 x Rubber cable holder with suction cap 1 x metal wall mount 1 x English operation manual