1. and portable, 2. Accurately measure water to protect the drinking water health of the whole family. 3. Multi-function switch at will 4. Dust-proof and splash-proof design: meet IP67 waterproof level 5. LCD backlit screen makes clear reading easier. Built-in high-sensitivity electrode head, high-sensitivity glass electrode, rust-proof electrode Specification: Product name: 7 in 1 water quality test pen Measuring range: PH/ORP/EC/TEMP/SALT/S.G/TDS Product size: 185 x 37 x 24mm Battery: 3*1.5V button battery Product measurement range: 1. PH value 0-14 2, TDS value 0-200000ppm 3. EC value 0-200000/cm 4. Salinity 0-20% 5. ORP negative potential 1999MV 6. H2 hydrogen 0-2400PPb 7. The specific gravity of S.G seawater is 1.000-1.222 8. Temperature 0-60 Material: ABS colour: white+blue Package Contents: 1 x 7-in-1 water quality pen 1 x English manul 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.