HM-500 Continuous pH/EC/TDS Monitor
Rechargeable continuous monitor for pH, EC/TDS and temperature, for wall mount, portable or benchtop use.
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Key features
HM Digital’s Hydro Master (HM-500) is a versatile continuous monitor, indicating pH, EC/TDS & Temp °C/°F providing accurate, stable readings the user can rely on. This unit can be wall mounted, is portable due to its rechargeable battery, and can be used as a benchtop monitor with its stand.
At a glance
- Scales
- pH, mS, ppm 0.5 (NaCl) Scale & 0.7 (442™) Scale
- Measures Potential Hydrogen (pH), Electrical Conductivity (EC), Total Dissolved Solids (TDS), Salinity, and Temperature
- Automatic Temperature Compensation (ATC) using three temperature coefficients
- Digital Calibration (push button) to any point within the meter’s range
- Large and easy-to-read LCD Screen
- Displays 3 parameters (Temp) or (pH,EC/TDS, Temp) simultaneously
- Replaceable Sensors (model SP-C2 for Conductivity, SP-P5 for pH)
- Factory Calibrated (pH/EC/TDS)
- Includes power cable, pH 4 & 7 calibration solutions, pH storage solution
- Rechargeable Battery
Specification
| pH Range | 0.0 – 14.0 pH |
| Temperature Range | 0 – 55 °C / 32 – 130 °F |
| TDS Range | 0 – 9990 ppm / 0 – 10.00 ppt |
| EC Range | 0 – 9990 µS / 0 – 20.00 mS |
| ATC Range | 0.0 – 60.0 °C |
| pH Accuracy | ± 0.1 pH |
| Temperature Accuracy | ± 1 °C / °F |
| EC/TDS Accuracy | ± 2% |
| pH Resolution | 0.1 pH |
| Temperature Resolution | 0.1 °C / 0.1 °F |
| TDS Resolution | 1 ppm (0 – 99.9); 1 ppm (100 – 999); 10 ppm (1000 – 9990); 0.01 ppt (0.01 – 10.00) |
| EC Resolution | 0.1 µS (0 – 99.9); 10 µS (100 – 999); 10 µS (1000 – 9990); 0.01 mS (0.01 – 20.00) |
| Scales | pH; °C / °F; TDS ppm and ppt (NaCl 0.5 and 442™ 0.7); EC µS / mS |
| Data Storage | Up to 20 readings |
| Auto Shut-off | After 5 minutes in battery mode |
| Alarm | Adjustable set point |
| Power Source | AC 110 – 240 V; rechargeable lithium-ion battery |
| Service Environment | 0 – 50 °C / RH 80% |
| Display | LCD touch screen with auto backlight |
| Probe | ABS conductivity sensor with electrodes; single junction Ag/AgCl pH sensor |
| Sensor Cable | 2 m (80 inch), shielded and coaxial |
| Dimensions | 20 x 11 x 3.6 cm (8 x 4 x 1.4 inches) approx. |
| Weight | 430 g body; 140 g for two probes (without case) |
Applications
HM Digital’s Hydro Master (HM-500) is a versatile continuous monitor, indicating pH, EC/TDS & Temp °C/°F providing accurate, stable readings the user can rely on. This unit can be wall mounted, is portable due to its rechargeable battery, and can be used as a benchtop monitor with its stand.
Accessories
- Power cable
- pH 4 and 7 calibration solutions
- pH storage solution
HM-500 Continuous pH/EC/TDS Monitor
Datasheets and manuals for this instrument, as PDF.



