Quality Material: Made of quality ABS material, more and provide fast accurate measurement. Frosted Case & Function Keys: Non-slip & Comfortable grip. Separate Electrode: Easy to operate. Backlight Button: Backlight display, easy to read and does not affect the use in the dark. ppt/ppm Conversion Button: The measurement unit can be according to the actual situation. Built-in Automatic Temperature compensation: For much more precise results. Wide Application: Suitable for the measuring of drinking water, hydroponics, aquarium, swimming pool, laboratory, etc. Power Supply:DC 9V Battery (Not Included) Temperature Compensation: 0-50 Operating Temperature: 0-50 Measurement Range: Temperature: 0-100 TDS: 0-1999ppm(LOW), 0-19.99ppt(HIGH) Resolution: Temperature: 0.1 TDS: 1ppm(LOW), 0.01ppt(HIGH) Accuracy: Temperature: 0.5 TDS: 2%F.S Operating steps: 1. Remove the protective cap,connect TDS electrode and temperature electrode into relative electrode socket. 2. Wash electrodes in distilled water,and dry it by filter paper. 3. Turn on by "ON-OFF" switch. 4. Put temperature electrode,conductivity electrode into liquid whichis to be test,and stir lightly.Wait until the digital is stable,read the final value. 5. "TDS/TEMP" to choice the TDS or TEMP, "ppt/ppm" to choicethe ppt or ppm. 6. After use,wash electrodes,put on protective cap. Color:As shown Material:plastic Package Contents: 1 * Digital Tester 1 * Sensor Probe Line 1 * Temperature Probe Line 1 * Screwdriver 1 * Users Manual(English) 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.