
Overview
Monitor and maintain precise water conditions effortlessly with the HM Digital HM-500 Hydromaster Continuous pH/TDS/EC/Temperature Meter. This comprehensive, all-in-one instrument is specifically designed for continuous monitoring in hydroponics, aquariums, pools, and laboratory environments, providing critical real-time data for optimal system management. The HM-500 accurately tracks pH, electrical conductivity (EC), total dissolved solids (TDS), and temperature, offering a complete overview of essential water quality parameters vital for healthy plant growth, thriving aquatic life, or accurate scientific analysis. Replacing the need for multiple individual meters, the Hydromaster delivers convenience, accuracy, and continuous insight into your water conditions.
Key Features
- Comprehensive Continuous Monitoring: Simultaneously and continuously measures pH, EC, TDS, and temperature for a complete and up-to-the-minute water quality assessment.
- Highly Accurate Readings: Features high-quality, reliable sensors that provide stable and trustworthy measurements for critical applications.
- User-Friendly LCD Touch Screen: Equipped with an intuitive color LCD touch screen and automatic backlighting for easy operation and clear readings in any lighting conditions.
- Versatile Power and Mounting Options: Powered by a rechargeable lithium-ion battery, allowing for portable use, convenient wall mounting, or stable benchtop operation.
- Integrated Data Storage: Saves up to 20 recent measurement readings, enabling users to easily track changes and trends in water parameters over time.
- Customizable Alarms: Allows users to set programmable high and low threshold alarms for pH, EC, and TDS, providing audible alerts when parameters fall outside the desired range.
Specifications
- Brand: HM Digital
- Model: HM-500 Hydromaster
- Parameters Measured: pH, Electrical Conductivity (EC), Total Dissolved Solids (TDS), Temperature
- EC Measurement Range: 0 - 9999 µS/cm
- TDS Measurement Range: 0 - 8560 ppm (based on 0.7 conversion factor)
- pH Measurement Range: 0.0 - 14.0 pH
- Temperature Measurement Range: 0.0 - 55.0 °C / 32.0 - 130.0 °F
- Resolution: pH: 0.1 pH, EC: 1 µS/cm, TDS: 1 ppm, Temperature: 0.1 °C/°F
- Accuracy: pH: ±0.1 pH, EC/TDS: ±2%, Temperature: ±0.5 °C / ±1 °F
- Power Source: Rechargeable Lithium-ion battery
- Display: Color LCD Touch Screen with Automatic Backlighting
- Sensor Type: Platinum EC/TDS sensor, Single Junction pH sensor (replaceable)
Ideal for
Essential for hydroponics systems, providing continuous monitoring to ensure optimal nutrient levels and pH balance for healthy plant growth. Crucial for maintaining stable and healthy conditions in aquariums by tracking pH, TDS, and temperature vital for aquatic life. Ideal for swimming pools and spas, allowing for continuous monitoring of pH and TDS levels for water quality management. Valuable for laboratory environments requiring precise and continuous measurement of key water parameters for experiments and analyses.
Performance and Characteristics
The HM Digital HM-500 Hydromaster delivers accurate and reliable continuous monitoring of key water quality parameters. Its high-quality sensors ensure stable readings, providing users with confidence in their data. The intuitive LCD touch screen interface simplifies operation and allows for easy navigation of settings and data. The rechargeable battery offers flexibility in placement and eliminates the need for constant power connections. The integrated data storage allows for convenient tracking of water parameter trends, while the customizable alarms provide immediate notification of any deviations from desired levels, enabling proactive adjustments to maintain optimal conditions.
Additional Information
HM Digital is a reputable manufacturer known for producing high-quality and reliable water quality testing instruments. The HM-500 Hydromaster is designed with user convenience and accuracy in mind, making it a valuable tool for various water monitoring applications. The replaceable pH sensor ensures the longevity of the device. Its comprehensive measurement capabilities in a single unit streamline water quality management, saving time and effort. The ability to customize alarms provides an added layer of security and control over critical water parameters, ensuring optimal conditions are maintained.
Kit Contents
- HM Digital HM-500 Hydromaster Continuous Meter
- pH Sensor
- EC/TDS Sensor
- Temperature Sensor (integrated)
- Rechargeable Lithium-ion Battery (built-in)
- USB Charging Cable
- Wall Mounting Bracket
- User Manual
Continuously monitor and maintain optimal water conditions for your hydroponics, aquarium, pool, or lab with the versatile and accurate HM Digital HM-500 Hydromaster!

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Range | pH: 0~14pH EC: 0~9990μS/0~20mS TDS: 0~9990ppm/ 0~10ppt Temp: 0~55°C/ 32~130°F |
Accuracy | pH: +/- 0.1pH EC: +/- 2% TDS: +/- 2% Temp: +/- 1°C / +/- 1.8°F |
Resolution | pH: 0.1pH EC: 0.1μS (0~99.9) 1μS (100~999) 10μS (1000~9990) 0.01mS (0.01~20.00) TDS: 0.1ppm (0~99.9) 1ppm (100~999) 10ppm (1000~9990) 0.01 ppt (0.01~10.00) Temp: 0.1°C/°F |
ATC | Yes |
Calibration | Digital |
Power | Rechargeable Li-ion Battery |
Size | 20 x 11 x 3.6 cm (8 x 4 x1.4 in) |
Weight | 430g/15.1oz |
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