A powerful multi-parameter pocket conductivity meter, including TDS and salinity measurement modes. The platinum-based electrode module offers fast, reliable results and is fully replaceable for reduced maintenance costs. The TDS conversion factor is adjustable to suit a plethora of different measurement requirements. The meter offers 1 to 3 points calibration functionality with automatic calibration solution recognition. Automatic temperature compensation provides accurate readings across the entire measurement range. The HL102 is designed for ease of use, with auto-hold functionality to freeze a stable reading for ease of recording. A visible battery indicator and auto-off functions effectively conserve and communicate battery life to the user.