Feature: 1. Accurately measure the hydrogen‑rich content in water to improve human sub‑health. 2. The waterproof grade is IP55, with excellent water resistance and field applicability. 3. The electrode can be replaced, and the host can be reused, saving costs. 4. Used in aquarium, aquaculture, soilless culture, swimming pools and hot springs, school laboratories, chemical industry, food or beverage manufacturing, textile printing and dyeing, paper or pulp bleaching, printing, cooling towers, boilers, washing or sewage treatment. 5. The product is small and portable and can be placed in a bag without taking up space. Specification: Condition:100% Brand New Item Type: PH MeterMaterial: ABSUses: Used in aquarium, aquaculture, soilless culture, swimming pools and hot springs, school laboratories, chemicals, food or beverage manufacturing, textile printing and dyeing, paper or pulp bleaching, printing, cooling towers, boilers, washing or sewage treatment.Battery Properties: 4 x Button Battery LR44 160mAh (not included). Package List: 1 x PH Meter1 x Manual1 x Screwdriver1 x Storage Box