Features: - This instrument has two positive and negative electrode rods (one is an iron rod and the other is an aluminum rod), it is small and light, strong and durable. - With TDS water quality test pen for testing water TDS value, convenient reading and recording. - High precision, measuring range 0 to 9990 ppm, quick test and obvious results. - The water electrolyzer test can be applied to water treatment industry, drinking water management, families, single stays, etc. Specification: Material: ABS + aluminum iron Size: Body length: approx. 10.7 × 9.7 × 2.6 cm Iron rod length: 7 cm Measuring range: 50-200 mg / L Rated voltage: 220 V / 50 Hz Plug type: EU plug [High quality material] Made of ABS + aluminum and iron, this water quality tester is small and light, sturdy and durable. The 4 electrolyte rods are 2 groups of positive and negative poles (each group has a positive pole and a negative pole) to better test the water quality. [Easy to Use] With our simple operation, our water