Features Portable Size: This salinity testing pen is small in size and light in weight, which is easy to carry around, suitable for different occasion. Easy Operation: This salinity testing pen is very simple to use and operation, there is no complicated operating process. Highly : This salinity testing pen is made from premium ABS material, which is sturdy and highly . High Accuracy: This salinity testing pen provides stable performance and highly accurate result, the screen is easy to read. Wide Application: This salinity testing pen is suitable for drinking water monitoring, waste water, laboratory, agriculture, aquaculture and aquarium, hydroponic, etc. Spec: 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 How to Use: 1. Remove the protective cover. 2. First, rinse the electrode with distilled water and absorb it with filter paper. 3. Press the on‑off button located on the top of the battery box to turn on the meter. 4. Immerse the meter electrode in the solution to be tested. 5. Stir gently and wait for the reading to stabilize. 6. After use, rinse the electrode with water to reduce pollution. Press the on‑off button to turn off the meter. 7. Be sure to close the protective cover after use. packing list: 1 xSalinity Tester 1 x Screw Driver 1 x User Manual 1 x Plastic Box Package List 1 x Salinity Tester 1 x Screw Driver 1 x User Manual 1 x Plastic Box