Multi-functional design: Combining PH or EC or TDS and temperature measurement functions. Immersed the electrode of the tester in water and waited for a few seconds to get the data on the LCD screen. One machine is multi-purpose, more economical and environmentally friendly. Multi-functional detachable probe: High-precision probe with high-precision algorithm chip ensures more accurate and faster response of the tester. The detachable probe design is convenient to carry and store, easy to replace. Lock button: After the value is stable, click the hold button to lock the current value. If you need to re-measure, please press the hold button again. Automatic temperature compensation: According to the Nernst equation, when the probe is inserted into the water from the air, there will be errors in the measured data due to the temperature change, automatic temperature compensation automatically calibrates the errors and maintains the accuracy of the data. Automatic temperature compensation range: 0.1-60, 32-140. Automatic power-off function and large screen display: PH tester has a backlight LCD that helps you clearly see the measurement in any case. The automatic power-off function turns off the power after 135 seconds without any operation to save power. Employs a fully transparent liquid crystal (LCD) to display 4-digit values and the corresponding physical quantity units. Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:As Shown Material:Plastic Package Contents: 1 x Multifunction PH Meter 3 x Calibration Powder 1 x English instruction manual 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.