Accurate & Reliable Water Quality Testing The HM Digital TDS-4 TDS Meter is a compact, handheld device designed to measure Total Dissolved Solids (TDS) in water quickly and accurately. Ideal for hydroponics, aquariums, drinking water, water filtration systems, and more, this easy-to-use meter delivers fast digital readings to help you monitor water quality with confidence. Key Features Measures Total Dissolved Solids (TDS) in ppm (mg/L) Measurement range: 0–9,990 ppm Automatic Temperature Compensation (ATC) Factory calibrated for immediate use Hold function for easy reading Auto-off function to preserve battery life Large, easy-to-read LCD display Includes protective carrying case Why Choose the TDS-4? The TDS-4 offers reliable performance at an affordable price point. Whether you're checking the effectiveness of a reverse osmosis system, maintaining optimal nutrient levels in hydroponics, or testing tap water quality, this meter provides consistent and dependable results. Specifications Model: TDS-4 Range: 0–9,990 ppm Resolution: 1 ppm (0–999 ppm) 10 ppm (1,000–9,990 ppm) Accuracy: ±2% ATC Range: 1–50°C Battery: 2 x 1.5V button cell batteries (included) What’s Included HM Digital TDS-4 Meter Protective carrying case User manual Batteries (installed)