Features: -This instrument has two-electrode positive and negative rods (one is an iron rod and the other is an aluminum rod), it is small, light, strong and durable. -With TDS water quality test pen to test the TDS value of water, playback and recording convenient. -High precision, measuring range 0-9990 ppm, fast test and obvious results. -The water electrolyzer test can be applied in water treatment industry, drinking water management, etc. Family, individual stay, 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: 220V / 50Hz < p>Plug type: EU plug Scope of delivery: 2 x water electrolyzer 1 x TDS electrolysis pen