Lightweight and portable Accurately measure water to protect the drinking water health of the family Multi-function switch Dust-proof and splash-proof design: meets IP67 waterproof level Large LCD backlit screen allows for clear and easy reading Built-in high-sensitivity electrode head, high-sensitivity glass electrode, rust-proof platinum electrode Specification: Product name: 7 in 1 water quality test pen Measuring range: PH/ORP/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 0-200000S/cm 4. Salinity 0-20% 5. ORP negative potential 1999mV 6. H2 hydrogen rich 0-2400ppb 7. S.G specific gravity of seawater 1.000-1.222 8. Temperature 0-60C Material: ABS Color: white+blue Package Contents: 1 x 7-in-1 water quality pen 1 x English manual Only the above package content is included, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the real thing. The measurement allowed error is +/- 1-3cm.