The water monitors is power by 4pcs button batteries.with bluetooth-compatible connection function 5-in-1 water tester: The Acidity meter can display Acidity, Temp data synchronously when measuring water, no need to switches back and forth with buttons The water detectors adopts a corrosion-resistant high-sensitivity probes, with high precisions of measurement result and fast and accurate readings Easy to use: operating after power on, the size is easy to carry The Acidity tester screen is rich in color, and the readings can be clearly display even during night measurement, and the data is clear, Manufacturer: Oxxggkao