Featuress: Suitable for: Check the TDS or EC of your aquarium, pool, or any water source. You can determine the effectiveness of your RO, DI, or distillation unit, check the nutrient levels of your hydroponic setup, and more. High precision: With the titanium alloy probe and the latest sensors, you can get almost exact readings every time. What ’s more, the meter can be easily recalibrated for extended precision whenever needed. Simple operation: Just dip in the meter, stir, and get your results in seconds. No calibration or setup needed, you can use it straight out of the box. Save money: Instead of forking out for an expensive lab test or professional equipment, you can get reliable results from home. Portable design: This meter can also be taken anywhere with you in the free leather case, ready to test on the go. Description: material: plastic Weight: 70g The packaging includes: 1 * Test pen