- HM Digital Pro COM-300 Meter
- 2 x AAA Batteries
- Lanyard
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HM Digital Pro COM-300 pH TDS EC Temp Meter
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- pH Range of 0 to 14 pH with 0.1 pH resolution
- EC Range from 0 to 9990 µS and 0 to 9.99 mS
- IP-67 waterproof rating with detachable platinum electrodes and pH glass sensor
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VOLUME PRICING
Commercial & Bulk Purchasing
We support operations & licensed facilities with volume pricing, dedicated account managers, and custom equipment consultation.
- You are monitoring complex hydroponic systems because you need absolute control over your nutrient solutions
- You are managing sensitive laboratory tests because you require professional accuracy from a multi-parameter meter
- The HM Digital Pro COM-300 adds critical pH monitoring capabilities compared to other models like the HM Digital Pro COM-100.
- This waterproof device features a large, easy-to-read LCD screen and digital calibration for professional accuracy.
- Growers managing complex hydroponic systems say they stopped guessing their nutrient levels after switching to this meter
- Lab technicians tracking multiple parameters say they rely on the portable design for fast and effortless readings
HM Digital Pro COM-300 pH TDS EC Temp Meter
Maintaining precise water quality is the cornerstone of a successful harvest. The HM Digital Pro COM-300 is a professional-grade, multi-parameter meter designed to give hydroponic growers and laboratory technicians absolute control over their nutrient solutions. By tracking pH, EC, TDS, salinity, and temperature in one portable device, you can ensure your plants are always in the optimal environment for growth.
Compared to other models like the HM Digital Pro COM-100, the COM-300 adds critical pH monitoring capabilities, making it a truly all-in-one solution. This waterproof device features a large, easy-to-read LCD screen and digital calibration for professional accuracy. Whether you are managing a complex hydroponic system or conducting sensitive lab tests, this meter provides the reliability you need.
As part of the world-renowned HM Digital collection, the COM-300 is built for durability with an IP-67 waterproof rating and replaceable sensors. For growers who only require specific measurements, we also offer the HM Digital Pro PH-200 for dedicated pH testing. Elevate your gardening precision with a tool that combines five essential metrics into a single, rugged handheld unit.
What's Included
Features
🌍
Variable Applications
Perfect for testing water in hydroponics, water treatment, and laboratory usage.
📱
Easy to Read
Large LCD screen makes checking your parameters quick and effortless.
🍃
Energy-Saving
Automatic shut-off feature preserves battery life when the meter is idle.
🔋
Battery Operated
Runs conveniently on a pair of standard AAA batteries for maximum portability.
Specifications
| Specification | Value |
|---|---|
| pH Range | 0 – 14 pH (0.1 pH resolution) |
| EC Range | 0 – 9990 µS; 0 – 9.99 mS |
| TDS Range | 0 – 8560 ppm (0.7 Scale); 0 – 5000 ppm (0.5 Scale) |
| Temperature Range | 0-55 °C; 32-130°F (0.1 °C/°F resolution) |
| Accuracy | +/- 2% |
| Conversion Factor | Non-linear for KCl, 442TM, or NaCl |
| Probe | Detachable platinum electrodes & pH glass sensor |
| Housing | IP-67 Waterproof (submersible and floats) |
| Power Source | 2 x AAA (included) |
| Dimensions | 18.5 x 3.4 x 3.4 cm (7.3 x 1.3 x 1.3 inches) |
| Weight | 101.5g (3.6 oz) |
FAQs
What parameters does the COM-300 measure?
The COM-300 is a 5-in-1 tool that measures pH, Electrical Conductivity (EC), Total Dissolved Solids (TDS), Salinity, and Temperature.
Is the COM-300 waterproof?
Yes, it is IP-67 rated, meaning it is fully waterproof, submersible, and designed to float if dropped into a reservoir.
Can I replace the sensor on this meter?
Yes, the COM-300 features replaceable sensors, allowing you to maintain the unit for years without needing to replace the entire device.
Does it come with everything needed to start?
The package includes the meter and 2 x AAA batteries. For pH testing, we recommend having calibration solutions on hand to ensure ongoing accuracy.
What is the difference between this and the COM-100?
The COM-300 includes pH measurement capabilities, whereas the COM-100 only measures EC, TDS, and Temperature.
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Questions About This Product?
Our specialists are happy to help. Call us or send a message and we'll get back to you within one business day (most of the time within a few hours.)
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