- HM Digital Pro COM-100 TDS EC Temp Meter
- Protective Cap
- 2 x AAA Batteries
- User Manual
Ask Sage about this product
HM Digital Pro COM-100 TDS EC Temp Meter
$89.99 USD
starting from 0% interest financing from
/mo.
- EC Range 0 ; 9990 µS; 0 ; 9.99 mS
- TDS Range 0 ; 8560 ppm (0.7 Scale); 0 ; 5000 ppm
- Powered by two AAA batteries with an auto-shutoff feature
- View More Details
Earn 89 points for shopping and get $0.89 off your next order. Join Harvest Club for free.
Free Shipping On Most Items*
To the lower 48
Transparent Pricing
Backed w/ price match guarantee
Secure Checkout
SSL encrypted payments
Questions? Talk to a specialist.
Mon to Fri, 9am to 5pm PST
- Free Shipping On Most Items*To the lower 48
- Transparent PricingBacked w/ price match guarantee
- 4.8/5 Top Quality Store on Google
- Secure CheckoutSSL encrypted payments
Ask Sage about this product
VOLUME PRICING
Commercial & Bulk Purchasing
We support operations & licensed facilities with volume pricing, dedicated account managers, and custom equipment consultation.
- You are managing nutrient strength and water quality because inconsistent readings lead to nutrient lockouts in your garden
- You are testing water runoff in a humid grow room because your current tools fail or fog up in damp conditions
- The one-button automatic calibration keeps the device accurate without complex menu navigation.
- The submersible housing allows you to test deep reservoirs safely without worrying about splashes.
- The digital display remains readable in any environment so you can check readings quickly.
- Growers monitoring nutrient strength say they stopped second-guessing their reservoir mix after switching to simultaneous readings
- Facility managers testing runoff in humid rooms say they no longer deal with screen fogging during daily maintenance checks
HM Digital Pro COM-100 TDS EC Temp Meter
Maintaining the perfect nutrient balance is critical for a successful harvest, yet many growers struggle with inconsistent readings and complex tools. The HM Digital Pro COM-100 TDS EC Temp Meter eliminates the guesswork, providing professional-grade precision in a rugged, pen-sized format. Whether you are managing a commercial facility or a home garden, this meter is the gold standard for monitoring water quality and nutrient strength.
This versatile device measures Electrical Conductivity (EC), Total Dissolved Solids (TDS), and temperature simultaneously. For growers who require even more comprehensive data, including pH levels, we recommend the HM Digital Pro COM-300 pH TDS EC Temp Meter. The COM-100 is engineered for durability and ease of use, featuring digital calibration and a large, easy-to-read LCD screen that ensures you get the right data every time.
As a staple in the HM Digital lineup, this meter is built to withstand the humid conditions of a grow room. It integrates seamlessly into your grow supplies toolkit, allowing for rapid testing of reservoirs and runoff. For those looking for a more entry-level solution for basic TDS testing, the HM Digital Pen Style COM-80 TDS EC Temp Meter is an excellent alternative.
What's Included
Features
📊
Simultaneous Readings
Measures EC, TDS, and temperature levels simultaneously for efficient water testing.
🔘
Digital Calibration
One-button automatic calibration ensures you maintain professional accuracy at all times.
📺
Large LCD Display
A high-contrast digital display ensures measurements are easy to read in any environment.
🔋
Battery-Operated
Powered by two AAA batteries with an auto-shutoff feature to maximize energy efficiency.
💧
IP-67 Waterproof
Fully waterproof housing that is submersible and floats for safe use in deep reservoirs.
Specifications
| Specification | Value |
|---|---|
| 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 |
| Resolution | 0.1 µS/ppm (0-99); 1 µS/ppm (100-999); 10 µS/ppm (1000-9990) |
| Accuracy | +/- 2% |
| Conversion Factor | Non-linear conversions for KCl, 442TM or NaCl |
| Probe | Detachable platinum electrodes |
| Housing | IP-67 Waterproof (submersible; floats) |
| Power Source | 2 x AAA Batteries (included) |
| Dimensions | 18.5 x 3.4 x 3.4 cm |
Warranty
The HM Digital Pro COM-100 is backed by a manufacturer's warranty covering defects in materials and workmanship. Please contact HM Digital or your authorized retailer for specific terms and claim procedures.
FAQs
What is the difference between EC and TDS?
EC (Electrical Conductivity) measures the water's ability to conduct electricity, which is directly related to the concentration of dissolved nutrients. TDS (Total Dissolved Solids) is a calculation of the total weight of dissolved solids, often converted from the EC reading using a specific scale (like 0.5 or 0.7).
How often should I calibrate the COM-100?
For best results, calibrate your meter once a month or before taking critical measurements. Frequent calibration ensures the sensors remain accurate, especially if you are testing high-concentration nutrient solutions.
Is the COM-100 probe replaceable?
Yes, the COM-100 features detachable platinum electrodes, allowing you to replace the sensor probe without having to purchase an entirely new digital meter.
Can this meter be used for saltwater aquariums?
Yes, the COM-100 is suitable for a wide range of water testing applications, including hydroponics, water purification, and aquaculture, provided the levels fall within the meter's specified range.
What does the IP-67 rating mean?
An IP-67 rating means the meter is completely dust-tight and can be submerged in water up to 1 meter deep for 30 minutes. It is also designed to float if dropped in a reservoir.
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.)
Why Trimleaf
Equipping home growers, craft producers, and commercial operations across North America since 2016.
10+
Years of Specialist Knowledge
4.8★
2004+ Verified Reviews
50,000+
Growers Served
120+
Top Equipment Brands in Stock