HM Digital TDS-3 Handheld TDS Meter with Carrying Case Ensure precise water quality monitoring in every environment with the HM Digital TDS-3. This rugged, pocket-sized meter delivers fast, reliable total dissolved solids (TDS) readings from 0 to 9,990 ppm, ideal for hydroponics, water purification, aquariums, pools, and industrial wastewater. With built-in automatic temperature compensation (ATC), a digital thermometer, hold and auto-off functions, plus a protective vinyl carry case, the TDS-3 keeps your measurements accurate, your workflow efficient, and your gear safe on the go. Key Features TDS Range: 0–9,990 ppm (1 ppm resolution up to 999; 10 ppm resolution indicated by “×10” above 1,000) ATC: Automatic adjustment from 1–50 °C for true-to-temperature readings Digital Thermometer: 0–80 °C range with 0.1 °C resolution Hold Function: Freeze stable readings for easy data logging Auto-Off: Powers down after 10 minutes to extend battery life Calibration: Factory-set with 342 ppm NaCl solution; recalibrate easily with included mini-screwdriver Durable Build: Water-resistant housing and vinyl carrying case with belt clip