Description
The HM Digital COM-300 is a professional-grade, waterproof combo meter designed for serious users who demand precision and versatility. Whether you’re testing hydroponic nutrient levels, aquarium water balance, or industrial water systems, this meter delivers reliable readings of pH, Electrical Conductivity (EC), Total Dissolved Solids (TDS), and Temperature – all from a compact handheld device. Its unique ability to measure in multiple units (µS, mS, PPM 0.5 & 0.7) and switch between EC-TDS conversion factors puts it ahead of standard meters. The auto-calibration feature supports pH 4.0, 7.0, and 10.0, with digital fine-tuning to dial in exact values within the operational range. Crafted with durability in mind, the COM-300 is waterproof and rugged, built for consistent performance in demanding environments. Designed in the USA and Korea by HM Digital, a trusted leader in water testing technology. Technical Specifications Measurement Parameters: pH, EC, TDS, Temperature TDS Ranges: 0-9990 ppm (0.5 & 0.7 conversion) EC Ranges: 0-9990 µS; 0-9.99 mS pH Range: 0.0 – 14.0 Temperature Range: 0 – 80°C (32 – 176°F) Calibration: One-touch automatic to pH 4.0, 7.0, or 10.0 Power Supply: 2 x AAA cell batteries (included) Warranty: 1 Year Manufacturer Warranty Origin: Designed in USA & Korea by HM Digital, Inc.
- ✅ 4-in-1 Combo Meter: Accurately measures pH, Temperature, TDS, and EC in a single device – perfect for water quality testing in labs, aquariums, hydroponics, pools, and more.
- 🌊 Waterproof & Durable: Built to withstand harsh environments with a water-resistant design, ideal for both indoor and outdoor professional use.
- 🔬 Advanced Multi-Scale TDS/EC Readings: Supports four measurement scales – mS, µS, PPM (0.5) and PPM (0.7) – with two selectable non-linear EC to TDS conversion factors, providing unparalleled accuracy and flexibility.
- 🧪 One-Touch Auto Calibration: Effortlessly calibrate to pH 4.0, 7.0, or 10.0 with automatic digital fine-tuning, ensuring precise measurements every time.
- 🇺🇸 Designed in the USA & Korea: Engineered by HM Digital, Inc. – Los Angeles, CA, combining American innovation with Korean technology for professional-grade performance.
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