Features: - This instrument has two positive and negative electrodes (one is an iron rod and the other is an aluminum rod), it is small and lightweight, sturdy and durable. - With TDS water quality test pen to test the TDS value of water, convenient reading and recording. - High precision, measuring range from 0 to 9990 ppm, quick test and clear results. - The water electrolyzer test can be applied to the water treatment industry, drinking water management, families, individual residences, etc. Specifications: Material: ABS + aluminum iron. Size: Body length: about 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] This water quality tester made of ABS + aluminum and iron is small and lightweight, sturdy and durable. The 4 electrolytic rods are composed of 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]