Usage Tips:Four-digit LED digital display, wide range of testing and control, with high precision and accuracy. Equipped with high-performance detection electrodes, it can monitor and control the pH value in water for a long time. Using AC voltage, 110V~ 240V optional. There are two functional product options: test and test and control. This product has long-term detection of pH values such as aquariums. When the pH value is higher or lower than the set value, it automatically turns on the power supply to power other equipment, and the solenoid valve is turned on to start supplying the reagent equipment required. Measuring range: pH: 0.00~ 14.00pH Resolution: pH: 0.01pH Accuracy: ± 0.1pH Setting control range: 3.50~ 10.50pH Automatic temperature compensation: 0 ℃~ 50 ℃ Working environment: 0 ℃~ 50 ℃; RH ≤ 95% Control power specification: 5A/110V-240VAC Display: 4-digit LCD display Power supply: with power adapter (suitable for all over the world) Plug Type:US Plug,it applies to Canada, India,Mexico, Thailand, the United States, the Philippines,Taiwan and so on. / EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on Voltage: AC110V / AC220V Color: As Shown Material: plastic<br > <br > Package Contents: 1 x Online digital pH controller Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.