The EC/TDS/Temperature meter mS/cm&ppt (HI99301) from Hannah Instruments is a waterproof portable meter that makes high‑range conductivity (EC), dissolved solids (TDS), and temperature testing simple and reliable. Built for field or lab use, this handheld instrument measures EC from 0.00 to 20.00 mS/cm and TDS from 0.00 to 10.00 ppt, with results automatically compensated for temperature for consistent accuracy. Its integrated two‑ring EC/TDS probe includes a built‑in temperature sensor and adjustable TDS factor and temperature compensation coefficients, letting users fine‑tune readings for specific sample types, just like the brand’s edge dedicated EC, 230 V Meter, and EC/TDS/Temperature meter µS/cm&ppm, while automatic one‑point calibration and clear LCD prompts make setup effortless. IP67 protection, a robust carrying case, and long battery life ensure durability in demanding environments. Designed for water treatment, environmental monitoring, HVAC, and manufacturing quality control, this meter offers precise performance wherever conductivity analysis is needed.