Advanced processor: automatically calibrated temperature; TDS tester measurement range of 0 - 9990ppm with 1ppm accuracy(Please receive the coupon code on the product page during checkout to get a better price.) Hold Button: Holds measurement value when meter is removed from water for convenient reading and recording Temperature Button: Tests water in Celsius and Fahrenheit; 31 - 200F degree range, 1F accuracy Auto-Off Feature: Automatically shuts off after 10 minutes of inactivity to preserve battery life Convenient: Comes with a leather carry case and clip, ideal for on the go Instructions: Step 1: Remove the protective cap. Step 2: Turn on the TDS meter. Step 3: Immerse the device in water or solution to the maximum immersion level. The height of the solution should not exceed 4cm (from the point of the pen). Step 4: The TDS value will be fixed on the display between 10-30 seconds. Press and hold hold key to lock the value. Step 5: Wipe off any remaining water from the pen with a cloth after finishing and replace the pen cap. Color: beige. Accuracy: +/-2%. Amplitude: 0-9990ppm. Item Dimensions: 155mm x 28mm x 15mm. Package:1 x TDS Meter Tester.1 x Leather Case.1 x User Manual.