Description : A TDS tester (also called ppm pen, nutrient tester, TDS stick) is an inexpensive and handy digital tool to instantly check your overall water quality. Easy to Use: With the press of a button, the TDS meter tells you your overall water purity level, which will be displayed on the screen in ppm (parts per million). Economical : the product has good linearity error and good consistency. Multi-purpose: this item can be used in water purifiers and filters, food (vegetables, fruits) and monitoring beverage quality, swimming pools, spas, aquariums and hydroponics. Caution: Do not drop the TDS meter assembly in water or dive beyond the level of the TDS meter. Maximum immersion (approx. 2 - Refer to manual for more information). This unit is not waterproof and will be damaged if water enters the unit. Description: Type: TDS-3 digital meter. TDS stands for Total Dissolved Solids, which is any salt, metal or mineral found in water. The lower the TDS level, the purer the water, with 0 ppm being pure H2O. Ideal for industry professionals and home use. Specifications: Measurement range: 0-9990ppm. Accuracy: 2% (FS) Power supply: 2 1.5 V. Automatic temperature compensation: 0C - 60C. Working temperature: 0C-50C. Dimensions: 156 x 40 x 20mm. Weight: 50g. The calibration procedure is as follows: In the test solution, press the ON/OFF button to turn it on. Press and hold the TEMP button for 3 seconds. LCD screen displays number 1 Hz flashes - Release hand, press TEMP button to increase value (press HOLD button to decrease value). When the required value is reached. Press MOD3 seconds again, the number on the LCD no longer flashes, keep flashing. Calibration is complete. Contents: 1 TDS 3 digital meter. 1 black carrying case. 1 English user manual. Note: - Due to hand measurement, sizes shown may vary slightly. We thank you for your understanding. - Depending on the brightness and light settings of the monitors, the color of the actual item may be slightly different from the pictures. Please take the actual product as reference. 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. Sold by-Dadangjia