High precision ozone testing: measures ozone concentration in water with reliable accuracy for professional and home use Portable and lightweight design: compact size of 146mm x 12mm, easy to carry for field or lab testing Electric powered operation: simple one-button measurement, no complex setup required Clear digital display: shows ozone readings quickly, for water treatment and aquaculture monitoring Construction: built for repeated use, suitable for pool, spa, and drinking water ozone level checks, Manufacturer: SOYWIM