Features Portable Size - This salinity test pen is small in size and lightweight, easy to carry, suitable for different occasions. Simple Operation: This salinity test pen is very simple to use and use, there is no complicated operation process. Wide Application This salinity test pen is suitable for monitoring drinking water, wastewater, laboratory, agriculture, aquaculture and aquarium, hydroponics, etc. HIGH PRECISION - This salinity test pen offers stable performance and highly accurate results, the screen is easy to read. HIGHLY DURABLE - This salinity test pen is made of high quality ABS material, sturdy and highly durable. Specification: Item Type: Salinity Tester Material: ABS Model: OW-98305 Battery: LR44 x 4 (battery not included) Uses: tap water, household water purifier, commercial water purifier, industrial water treatment industry, etc. Basic parameters: Scope: 0 ~ 199.9ppt Resolution: 0.1 ppt Accuracy: ±2% F.S. Package List:1 x Salinity Tester 1 x Screwdriver 1 x user manual (English language not guaranteed). 1 x Plastic Box Package List 1 x Salinity Tester 1 x Screw Driver 1 x User Manual 1 x Plastic Box