Features: 1. 5-In-1 Multi-Function Tester 2. One-Click Mode Switching 3. Total Dissolved Solid Value In Water (1~20000ppm) 4. Seawater Salinity Is The Ratio Of The Total Dissolved Solids To The Weight Of Seawater. It Is Usually Expressed In Grams Per Kilogram Of Seawater. Measuring Range: 10.1~200.0ppt 5. High-Definition Backlight, Clear Display Even At Night Description: 1. Test Items: PH, Salinity 2. Measurement Accuracy: 1ppm 1us/Cm 0.01ph 0.01% 3. Salinometer: Multi-Parameter Water Quality Detector 4. Type: Voice Charging Five-In-One Multi-Function Pen 5. Measuring Range: Salinity: 0.00 To 25.00% Ph: 0-14 6. Resolution: 1ppm 1us/Cm 0.01ph 0.01% Note: Voice Model Does Not Include Batteries Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Material: ABS colour: As Shown Package Contents: 1 x Water Quality Detector 1 x Data Cable 1 x Chinese and English instructions Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.