7 in 1 Water Quality Tester Portable Digital Water Quality Test Pen PH/TDS/EC/Salinity/ORP/S.G/Temperature Measuring (with Backlight)

Features:
One button to switch function.
Whole machine waterproof.
Battary can be replaced easily.
Portable design for easy carrying and storage.
Quick and accurate test.
Large and clear screen to view the value.
Real-time display the remaining battery power.