This water testing pen combines user friendly integrated design with touch measurement, HOLD function for result retention, and replaceable 3V coin battery for extended outdoor / indoor use Essential for families, aquarium enthusiasts, hydroponic gardeners, and travelers requiring dependable water analysis in homes, labs, or remote locations Perfect for daily checks of tap water, pool maintenance, water systems, and agricultural irrigation with its slip resistant ergonomic grip Accurately measure and levels ( 0 9990ppm / 0 9999us / cm) with built in temperature ( 0 60℃ / 32 140℉), ideal for testing drinking water purity and detecting in household / aquarium environments Engineered with ABS housing and anti slip texture, this portable meter delivers laboratory grade in pocket sized convenience for quick water assessments, Manufacturer: Whoasyst