TDS Meter Tester - Good tester provides precise data!Features: Usages: This item can be used in water purifiers and filters, food (vegetable, fruits) & drink quality monitoring, pools and spas, aquariums, hydroponics. Data Hold Function: Freeze the measurement to view it out of the water. Great for checking your tap water quality, or knowing when to change a filter. Automatic Shut-Off: For lower power-consumption for years of reliable measurement. The automatic shut off function is very smart and convenient.Specifications: Hold function: Saves measurements for convenient reading and recording Auto-off function: Turns off meter after 10 minutes of non-use to conserve batteries Rang: 0-9990ppm Accuracy: 2%F.S Battery: 2 x 1.5V Button Cell battery (Not Included) Item size: 156 mm x 30 mm x 20 mm / 6.14 inches * 1.18 inches * 0.79 inchPackage Included:1 x TDS Meter TesterPromise: If the product has any quality problems, please feel free to contact us, we will help you solve the problem as quickly as possible.