Item Type: Digital TDS Test Pen_x000D_ Material: ABS_x000D_ Battery: 3V button battery CR1225 x 1 (without battery)_x000D_ Use: Domestic water, swimming pool, aquaculture, environmental water quality, agricultural water, fish tank water quality, greenhouse flowers, barreled water, community water station_x000D_ Basic Parameter:_x000D_ Test Range: 0-9990ppm 1[LCD Display Screen] Water purity tester adopts high definition display screen, more convenient for reading values. 2[Sensitive Probe] Digital water tester uses high sensitivity probe, which is anti rust, ensures long term usage. 3[Anti Interference] The probe could avoid being interfered by magnetic field in water, ensures accurate value. 4[Compact Size] The TDS test pen has a compact size and exquisite mirror pen body, easy to carry around. 5[Wide Usage] The TDS detector can be used for domestic water, swimming pool, aquaculture, environmental water quality, agricultural water, fish tank, etc.1 x_x000D_ _x000D_ DigitalTDSTestPen