SMART WIFI CONTROLLER: Compatible with iOS and Android systems, you can view the current and historical data on your mobile phone. Remote access to view pH/ORP data so you're not constantly wondering. USER FRIENDLY: The tester comes with a separate electrode for pH/ORP/Temperature, fast response with more stable reading. It also has backlight control so it's easy to read even in dim lightsimple & convenient operation. 24/7 TEST: This hydroponics digital tester can be used for 24/7 online monitoring, monitoring, and control (dosing pump or CO2 regulator) for your pH up or down in the water. OUTPUT POWER RELAY: You can plug in your own device (e.g. oxygen pump, CO2-regulator, O3 ozonizer, etc.) into the corresponding pH or ORP output power socket and then set your desired pH / ORP value point. Output active to trigger your devices to turn on when the measurement is higher or lower than the selected set point. EASY TO USE: The upper and lower limits of pH and ORP can be set easily according to your needs in App with your mobile phone. When the test result is below the lower limit or above the upper limit, the user will receive a notification alert from the smartphone. You can view the data curve of pH/ORP for the past 30 days in the APP, easy to compare and analyze and formulate solutions. REPLACEABLE HI-PRECISION ELECTRODE: Fast response with more stable reading and replace it with another pH or ORP probe as long as it comes with the standard BNC connector. It is more efficient and cost-saving.