Feature: 1. Easy to use, the digital water quality TDS tester has a backlight display, which is convenient for you to read the data. 2. It is suitable for testing total dissolved solids (TDS) in all households and laboratories, including aquariums and swimming pools. 3. Comfortable to hold, lightweight handheld design with protective cover for portability and comfort. 4. Lightweight and portable, small in size and light in weight, it is convenient to carry and use to measure water quality. 5. It is suitable for testing water, soil, swimming pools, aquariums, spas, hydroponics, food, beverages, wine and beer, etc. Specification: Item Type: TDS meter Material: Plastic Weight: Approx. 114g / 4oz Product Size: Approx. 151x33x17mm / 5.9x1.3x0.7in Color: Green Range: 0.00~1999ppm(mg/L) Resolution: 1ppm (mg/L) Accuracy: ±2%F.S Battery: 4x1.5V button battery (not included) Temperature Compensation: 0℃~50℃ Working Temperature: 0℃~50℃ Application: Suitable for testing total dissolved solids (tds) in all households and laboratories, including aquariums and swimming pools.. Package List: 1 x TDS Tester (Battery Not Included)1 x Screwdriver1 x Manual