Digital TDS Tester Pen Portable Water Quality TDS EC and Temperature Meter Purity Meter TEMP PPM Test Thermometer [Accurate Measurement]: TDS Water Meter Can be Tested ppm, Electrical Conductivity, Celsius and Fahrenheit Temperature. Titanium Alloy Pobe, Large Back-Lit Screen for Easy Reading. Temperature Sensor Has Automatic Temperature Compensation. Please note: This meter CANNOT calibrate [4 Display Mode] :TDS - ppm andamp; °C; EC - μs / cm andamp; °C;TDS - ppm andamp; °F;EC - μs / cm andamp; °F. [Auto Power Off andamp; Data Hold Function]: Automatic Shutdown after Two Minutes of No Opperation, so the Battery will Not Run Out. The Hold Button Makes Data Reading And Recording Easier. Press the Hold Button, and then Remove it from the Test Solution. [Wide Application]:The TDS Water Tester Can Be Used to Test Drinking Water, Fish Tank Water, Pool andamp; Spa, Water Treatment and so on. [Extra PH Test Paper]:You Will Recieve- 1 X Water Test Meter, 1 X Protective Leather Case, 1 X Ph Test Paper, 1 X User Manual. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.