Smart Handheld 6-in-1 Dissolved Oxygen/PH/TDS/EC/SALT/TEMP Water Quality Analyzer Operating System iOS 7.0 or later, Android 4.3 or later Tester Automatic Calibration pH Tester Capacity 1500ml (57oz) Probe ... Read More
5-in-1 Digital Meter PH Salinity Temperature TDS EC Tester With Backlight For Water Quality Monitoring Product Attributes Attribute Value Shape Pen Type Power Supply 2 x 1.5V AAA Batteries Calibration 5 point ... Read More