You do not need to worry about the temperature of the solution affecting the measurement results, as both and TDS meter have automatic temperature compensation functions that can be adjusted according to the water temperature. All adopt sensitive probes, which can quickly and accurately read, effectively helping you determine the value of water or solution and detect impurities in it. In order to achieve accuracy, the measuring instrument is equipped with flexible glass probes, and the TDS measuring instrument is equipped with alloy probes. As tools for improve life quality, they can be used to test and water quality in drinking water, swimming pools, aquariums, reverse system, hydrotherapy or hydroponics. It can be easily placed in your pocket. Handheld to complete the detection, press the button, and the and TDS water quality testers will tell you the overall water puritying level of the liquid. Meter Detection Range: 0-14PH Resolution: 0.01PH Accuracy: 0.1PH Working Temperature: 0~60 Size: 149x25.5x15mm/5.87x1.00x0.59in TDS Meter Measurement Range: 0~99990ppm Measurement error: 2% Temperature Measurement Range: 0-99 (32-212 ) Size: 150x26x15mm/5.91x1.02x0.59in Package Includes: 1x meter 1x TDS meter 2x 3V CR2032 Button Battery 3x Meter Calibration Powder(PH6.86, PH9.18, PH4) Colour:White Material:ABS Package Contents: 1 set x zero water tester Note: After the TDS meter penetrates into the solution to be test, it needs to be stirred to avoid bubbling. When the meter is opened in air, the value will jump irregularly due to the sensitive glass probes, which is normal. The values in the air cannot be used as a reference. 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.