- 1 x HM Digital COM-80 TDS/EC/Temp Meter
- 3 x 1.5V Button Cell Batteries (LR44)
- Protective Cap
HM Digital Pen Style COM-80 TDS EC Temp Meter
$49.99 USD
- 0 to 9990 µS EC and 0 to 5000 ppm TDS measurement range
- One touch digital calibration removes the need for manual adjustment screws
- Includes 3 LR44 batteries providing up to 1000 hours of continuous use
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Who This Is For
- You are switching to digital testing because interpreting color charts on liquid test kits is too subjective.
- You are monitoring reservoirs more closely because inconsistent nutrient levels are stalling your plant growth.
What We Found
- The digital calibration is much faster than using a tiny screwdriver on the older analog styles we used to sell.
- We found the water resistant housing actually holds up well to the occasional drop into the nutrient tank.
What Users Say
- Users who swapped to this model say they stopped double checking their readings with secondary backup meters.
- Growers who test multiple tanks daily say the instant temperature compensation saved them several minutes per run.
HM Digital Pen Style COM-80 TDS EC Temp Meter
Maintaining the perfect nutrient balance is critical for any successful grow, yet many hobbyists struggle with inconsistent readings and complex calibration. The HM Digital Pen Style COM-80 TDS EC Temp Meter solves this by providing a professional-grade, highly accurate solution that is both affordable and incredibly easy to use. Whether you are monitoring hydroponic reservoirs or testing tap water, this meter ensures your plants receive exactly what they need to thrive.
This versatile tool allows you to measure Electrical Conductivity (EC), Total Dissolved Solids (TDS), and temperature simultaneously, giving you a complete picture of your water quality in seconds. For growers looking for a complete testing suite, pairing this with the HM Digital PH-80 pH Temp Meter allows for full control over your water chemistry. If you require even higher precision or professional-grade durability for commercial applications, consider upgrading to the HM Digital Pro COM-100 TDS EC Temp Meter.
Designed by HM Digital, the COM-80 features a sleek, water-resistant housing and a large LCD for clear visibility in any environment. With its one-touch digital calibration and automatic temperature compensation, you can spend less time fiddling with equipment and more time focusing on your harvest. It is the ideal entry-point for anyone serious about cannabis nutrients and water management.
What's Included
Features
📊
Simultaneous Readings
Measures EC, TDS, and temperature levels at the same time for fast analysis.
🔘
Digital Calibration
Features one-touch automatic calibration for consistently accurate nutrient readings.
🖥️
Large LCD
The compact frame holds a large display to ensure you get correct measurements every time.
🔋
Battery-Operated
Enjoy up to 1000 hours of battery life with standard LR44 button cell batteries.
Specifications
| Specification | Value |
|---|---|
| EC Range | 0 – 9990 µS; 0 – 9.9 mS |
| TDS Range | 0 – 5000 ppm (0.5 Scale); 0-8560 ppm (0.7 Scale) |
| Temperature Range | 1-80 °C; 33-176 °F |
| Resolution | 1 µS/ppm; 0.1 mS |
| Temp. Resolution | 0.1 °C/F |
| Accuracy | +/- 2% |
| Power source | 3 x 1.5V button cell batteries (LR44 included) |
| Dimensions | 15.3 x 3.2 x 1.8 cm (6.0 x 1.3 x 0.7 inches) |
| Weight | 53.9g (1.9 oz) |
Warranty
HM Digital products are covered by a manufacturer's warranty against defects in materials and workmanship. Please contact support for specific warranty duration and coverage details.
FAQs
How often should I calibrate the COM-80?
For best results, calibrate your meter once a month or if you suspect inaccurate readings. Frequent use in highly concentrated solutions may require more frequent calibration.
Is the HM Digital COM-80 waterproof?
The COM-80 is water-resistant, meaning it can handle splashes and brief contact with water, but it should not be fully submerged for extended periods.
Can this meter measure pH levels?
No, the COM-80 is designed specifically for TDS (Total Dissolved Solids), EC (Electrical Conductivity), and temperature. To measure pH, we recommend the HM Digital PH-80.
What type of batteries does it use?
It uses three 1.5V button cell batteries (LR44 or equivalent), which are included with your purchase and provide roughly 1000 hours of usage.
What is the difference between the 0.5 and 0.7 TDS scales?
Different regions and nutrient brands use different conversion factors. The COM-80 allows you to read in both scales to ensure compatibility with your specific nutrient chart.
Happy To Help
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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