Usage Tips:Multi-functional design: Combining PH/EC/TDS/Salinity 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. Automatic temperature compensation: According to the Nernst equation, when the probe is inserted into the water from the air, there 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°F-140°F Lock button: After the value is stable, click the hold button to lock the current value. If you need to re-measure, please the hold button again. 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. Automatic power-off function & large screen display: The PH tester is equipped with a backlit LCD display that shows 4-digit values and the corresponding physical units. This helps you to clearly see the measurement results in any situation. The automatic power-off function saves power by turning off the unit after 135 seconds without any additional operation. Wide range of applications: Can be used for Aquarium, Hydroponic, Drinking water, Swimming pool, Freshwater Tank, Pond Colour:Black Material:ABS Package Contents: 1 * Water quality tester 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.