s: The LCD digital TDS meter tester is used for testing the filter water quality purity, to check the performance of your water. In order to make sure you for always drink pure and safe water, the TDS meter tester is recommended for every family. Features: The TDS meter tester can be used in: water purifiers and filters, food (vegetable, fruits) & drink quality monitoring, pools and spas, aquariums, hydroponics etc. Hold function: Saves measurements for convenient reading and recording. Auto-off function: Turns off meter after 10 minutes of non-use to conserve batteries. Press "TEMP" button can shift temperature meter between fahrenheit degree and centigrade degree. Measuring Range: 0-9990ppm, with a resolution of 1ppm. From 1,000 to 9,990ppm, the resolution is 10ppm, indicated by drinking x 10 symbol, factory calibrated. Applicable industries: water laboratories, CDC, the aquaculture industry, hospitals, swimming pools, household tap water quality testing. Specifications: for Shell Material: Plastic Main Color: Yellow/for Grey/Red/Blue Operating Temperature: 0-50C (32-122F) Accuracy: 2% Battery: 2 x 1.5V Button Cell Batteries (Not Included) Size: Approx. 15.5x3x1.6cm/6.1x1.1x0.6" Quantity: 1 Pc Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package Contents: 1 x TDS Meter 1 x User Manual