Maintance： -Keep the electrode clean ，cover the electrode protective sleeve ，please take out the batteries for long periods idle. -Avoid heat，direct sunlightDescription: This TDS & EC meter is a combination of TDS meter and EC meter.It can test the dissolved solids content and the EC value in water to check the water quality.It is easy to operate and has the lock function and auto shut off function.And the LCD screen is easy to read and record.Features: - Combination of TDS meter and EC meter - Lock Function: easy to read and record.The instrument will lock the reading - Auto shut-off: Turn off automatically after 5 minutes of non-use，conserve batteries - Automatic temperature compensation - The temperature can choose Celsius and Fahrenheit - Shift between TDS and Conductivity - LCD screen ，easy to read and record - Can be used in drinking water、pools and spas， aquarium， hydroponics，etc - Include 1xCR2032 batterySpecification: Measurement Range: Conductity: 0-9990us/cm TDS: 0-9990ppm Degrees Celsius:0-80℃ Degrees Fahrenheit: 32-176℉ Accuracy: ±2% N.W.: 55g Size: 154x30x14mm Color: WhiteUse steps: 1.Unplug the electrode protective sleeve before use 2.Press the switch，place the electrode into the test sloution 3.After the numerically stable，press the HOLD button and take it out of the solution to read 4.After reading，turn off the meter ，wipe clean the electrode before sleeving itPackage Includes: 1 x TDS&EC Digital Meter 1 x Black Carry Case 1 x 1.CR2032 Battery(inserted in device) 1 x User Manual