Features： 1、Portable Size: This salinity testing pen is small in size and light in weight, which is easy to carry around, suitable for different occasion. 2、Easy Operation: This salinity testing pen is very simple to use and operation, there is no complicated operating process. 3、Wide Application: This salinity testing pen is suitable for drinking water monitoring, waste water, laboratory, agriculture, aquaculture and aquarium, hydroponic, etc. 4、High Accuracy: This salinity testing pen provides stable performance and highly accurate result, the screen is easy to read. 5、Highly Durable: This salinity testing pen is made from ABS material, which is sturdy and highly durable. Specification： Item Type: Salinity Tester Material: ABS Model: Salinity-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: 0.1ppt Accuracy: ±2%F.S Package List： 1 x Salinity Tester 1 x Screw Driver 1 x User Manual 1 x Plastic Box