Features Accurate Testing: This TDS test pen can achieve accurate and fast testing values, giving you a good data reference effect. Ti Alloy Probe: This water quality test pen has a sensitive probe of corrosion resistant Ti alloy, which is sturdy and durable and works stably. Backlit HD Display: The water quality tester has a backlit HD display, which can be measured at power on and operated by the button. Easy to Carry: The overall weight of the water quality test pen is light and very easy to carry, and can be easily stored in a bag. Scope of Use: Water quality test pen is suitable for domestic water, swimming pool, aquaculture, environmental water quality, agricultural water, fish tank water quality, greenhouse flowers, barrel water, community water station. Specification: Item Type: TDS Test Pen Model: TDS 3 Material: ABS Battery: 1.5V button cell LR44 x 2 (without battery) Uses: Domestic water, swimming pools, aquaculture, environmental water quality, agricultural water, fish tank water quality, greenhouse flowers, barrels of water, community water stations Basic Parameters: Test Range: 0-9990ppm Package List:1 x TDS Test Pen Package List 1 x TDS Test Pen