HI9814 GroPro Waterproof Portable pH/EC/TDS/Temperature Meter for Hydroponics. The HI9814 is a slim lightweight and waterproof portable meter that measures pH conductivity (EC) total dissolved solids (TDS) and temperature with a single amplified probe. The meter operation is simplified with two buttons. One is used for on/off and for calibration while the other is used to switch between the measurement modes. The HI9814 has advanced features including an selectable EC to TDS conversion factor (0.5 - 500 ppm and 0.7 - 700 ppm). 3 in 1 amplified probe with pH EC/TDS and temperature sensors. Quick Cal Mode to calibrate pH and EC/TDS with one solution. Conversion Factor (CF) selectable between 0.5 (500 ppm) and 0.7 (700 ppm). The HI9814 portable meter features a large multi level LCD which displays both pH EC or TDS and temperature readings simultaneously.