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Description
HM Digital Pro Series Pen style pH/TDS/EC/Temp meterCOM 300: Waterproof Professional Series pH EC TDS Temp Meter The COM 300 is a professional grade level pH EC TDS Temp meter ideal for all water quality testing, hydroponics, water purification applications, wastewater regulation, aquaculture, colloidal silver, labs & scientific testing, pools & spas, ecology testing, boilers & cooling towers, water treatment and more. Features Measures Potential Hydrogen (pH), Electrical Conductivity (EC), Total
COM-300: Waterproof Professional Series pH/EC/TDS/Temp Meter
The COM-300 is a professional grade level pH/EC/TDS/Temp meter ideal for all water quality testing, hydroponics, water purification applications, wastewater regulation, aquaculture, colloidal silver, labs & scientific testing, pools & spas, ecology testing, boilers & cooling towers, water treatment and more.
Features
Measures Potential Hydrogen (pH), Electrical Conductivity (EC), Total Dissolved Solids (TDS), and Temperature
Five scales: pH, µS, mS, ppm 0.5 (NaCl) Scale & 0.7 (442™) Scale
Automatic Temperature Compensation (ATC) using three temperature coefficients
Waterproof housing (IP-67 rating)
Digital Calibration (push button) to any point within the meter’s range
Auto-off function, data-hold function and low-battery indicator
Display: large and easy-to-read LCD screen includes simultaneous temperature reading
Replaceable Sensor (model SP-C3)
Factory Calibrated (pH/EC/TDS)
Includes translucent cap, 2 (AAA) alkaline batteries, pH 4 & 7 calibration solutions, pH storage solution and lanyard
Specifications
pH Range: 0 – 14 pH
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:
pH: 0.1pH
EC 0 – 999 : 1µS ; 1000 – 9990 : µS ; 0- 9.99 mS :0.01 mS
TDS 0 – 999 : 1ppm / 1000 – 9990: 10 ppm
Temperature 0.1 °C/°F
Accuracy: +/- 2%
EC to TDS Conversion Factor: Non-linear conversions for KCl, 442TM or NaCl solutions, selected by the user.
Probe: Detachable platinum electrodes & pH glass sensor with reference tube electrodes
Housing: IP-67 Waterproof (submersible; floats)
Power source: 2 x Triple A (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)
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.6 ★★★★★
Based on 19 reviews
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Product Reviews
★★★★★ 5
Comfortable, lightweight, and very practical
Size: 40, Color: Black
These Vcansion cargo shorts are extremely comfortable and easy to wear. The cotton fabric is lightweight and breathable, making them great for warm weather. The loose fit gives plenty of room to move without feeling baggy or sloppy.
The multiple pockets are a big plus. They’re well sized and actually usable, which makes these shorts perfect for casual wear, travel, or working around the house. They sit comfortably at the waist and feel well made for the price.
If you want casual shorts that are comfortable, functional, and versatile, these are a great buy. I’d definitely pick up another pair.
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Reviewed in the United States on December 17, 2025
★★★★★ 5
Best lightweight cargo shorts I own!
Size: 34, Color: Black, Size: 34, Color: Black
These are my new go-to shorts for summer. The cotton material is breathable and feels great—you barely notice you're wearing them. I love the classic look and the practical design; the loose fit allows for maximum comfort and movement. All of the multi-pockets are sturdy and well-sewn, making them perfect for camping, fishing, or just relaxing. They hold up perfectly in the wash. Excellent value, fit, and utility
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Reviewed in the United States on October 8, 2025
★★★★★ 5
Great Quality
Size: 34, Color: #01black
Shorts I ordered were great. Good quality and perfect fit. Exact color I ordered. Won’t hesitate in ordering more in the future
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Reviewed in the United States on May 9, 2026
★★★★★ 4
Online vs Instore
Size: 40, Color: #01khaki
As to be expected, not seeing and touching before purchase. I bought three pairs of these shorts in different colors for a trip to see my son graduate from his Army National guard AIT. I would rate the overall a five based on fit, quality, and comfort. One thing that I have to mark down, is they have elastic waist bands as described! In the description pic's, they are shown with nice long tie strings. The reality of what I received is the stings are too short to tie. They were almost the same circumference as the waist band, so only able to tie in a small knot, rather than a bow. no Biggy, until it's time for the restroom. Hopefully it's self explanitory....fumbling around with a knot! waist fits as stated to my size, but add weight of wallet and cell phone, and after a few steps, they begin to slide down. Tie string a must. I will see about finding something longer, as I do like them overall!
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Reviewed in the United States on October 7, 2023
★★★★★ 5
Great fabric and quality
These shorts were a gift for my boyfriend who loved how comfortable they were!!! They washed very well bought them to match an army t shirt and they both matched perfectly!!! Size was perfect would definitely recommend these for the man in your life!!
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Reviewed in the United States on January 26, 2026
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