1. Lightweight and portable,2. Accurately measure water to the drinking water health of the whole .3. Multi-function switch at will4. Dust-proof and splash-proof design: meet IP67 waterproof level5. LCD backlit screen makes clear reading easier. Built-in high-sensitivity electrode head, high-sensitivity glass electrode, rust-proof electrodeSpecification:Product name: 7 in 1 water quality test penMeasuring range: PH/ORP//TEMP/SALT/S.G/TDSProduct size: 185 x 37 x 24mmBattery: 3*1.5V button batteryProduct measurement range:1. PH value 0-142, TDS value 0-200000ppm3. value 0-200000/cm4. Salinity 0-20%5. ORP negative potential 1999MV6. H2 hydrogen 0-2400PPb7. The gravity of S.G seawater is 1.000-1.2228. Temperature 0-60Material: ABScolour: white+bluePackage Contents:1 x 7-in-1 water quality pen1 x English manulOnly the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.