SKU: 92150993446

SM-1 HM Digital In-Line Single TDS Monitor

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Description

SM-1 HM Digital In-Line Single TDS MonitorHM Digital SM 1 In Line Single TDS Monitor Ideal for monitoring the performance of a home RO water treatment system. The SM 1 is provides an easy to read single line TDS monitor that provides a digital readout. It is ideal for any water filtration system, including reverse osmosis systems, coolers and much more. Features of HM Digital SM 1 Total Dissolved Solids Meter Displays TDS level of a single water line Efficient and accurate Auto Off function


HM Digital SM-1 In-Line Single TDS Monitor

Ideal for monitoring the performance of a home RO water treatment system.

The SM-1 is provides an easy to read single line TDS monitor that provides a digital readout. It is ideal for any water filtration system, including reverse osmosis systems, coolers and much more.

Features of HM Digital SM-1 Total Dissolved Solids Meter

  • Displays TDS level of a single water line
  • Efficient and accurate
  • Auto-Off function conserves battery power. (Shuts off automatically after 10 minutes of non-use)
  • Factory Calibrated: our meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver.
  • Installs quickly and easily

Note: This model requires a tee fitting (sold separately) for installation. Recommended Fitting for 1/4" Tube F-4UT44QC

*The SM-1 has a 3 digit display. For measurements of 0-999 ppm, the resolution is 1 ppm. From 1000 to 9990 ppm, the resolution is 10pm, and is indicated by a blinking x10' image.)

 

SM-1 Specifications

Model: SM-1
Brand: HM Digital
Measures: Total Dissolved Solids (TDS)
Measurement Unit: Parts Per Million (PPM)
Range: 0-9990 ppm*
Resolution:

 0-999 ppm: 1 ppm
1000 - 9990 ppm: 10 ppm
Accuracy: +/- 2%
Cable Length: 24.5" (including sensor)
Fittings: Not included. Requires 1/4" QC tee.
Power Source: 2x 1.5v button cell batteries (LR44 or equivalent); included
Battery Life: Approx. 1000 hours of continuous use
Size: 3" x 8" x 1.9" (7.6 x 2 x 4.7 cm)
Weight: 2.8 oz (79.4 g)
Conversion Factor: NaCl (avg. 0.5)



 

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. 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
SKU: 92150993446

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4.6 ★★★★★
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F
Verified Purchase
FBCALLO
Whiting, US
★★★★★ 5
Good Fit
Color: All White, Size: Large
Good fit.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 28, 2026
K
Verified Purchase
Kurt Schmidt
West Palm Beach, US
★★★★★ 3
The neck view
Color: All Black, Size: Large
The neck portion is higher than expected
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Reviewed in the United States on May 19, 2026
J
Verified Purchase
James Eagleson
Whiting, US
★★★★★ 5
nice looking & comfortable
Color: All White, Size: X-Large
almost immediate delivery & a great value for the money & quite comfortable too.
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Reviewed in the United States on February 28, 2026
M
Verified Purchase
Mauricio Bedoya Estrada
Carnegie, US
★★★★★ 5
Buen producto
Excelente material
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Reviewed in the United States on January 18, 2026
B
B. Capossere
San Leandro, US
★★★★★ 5
nice color and fit
I bought the Laurel Green Large Fit: Fit as expected. The large is a nice fit for me at 5'4" and 140-145 lbs (depending on the week). I prefer a loose or relaxed fit rather than form-fitting/slim and that's what I have in the large. It doesn't hang or billow, sleeves don't go down too far, but it moves nicely and is quite comfortable. Feel: the fabric feels nice on the skin and is cool on the skin as well. We're in the lowe 40s here now, so hard to say how it will feel in the summer. The fabric itself will feel cool but breathability in muggy summer will have to wait to test Look: the laurel green is a very nice, very pleasant subtle color which I like a lot. I also like the little design touches--the cuffed sleeves, the covered buttons. It has some weight to it so it hangs nicely and the weight combined with fabric makes it less prone to wrinkles quality: all looks good. Clean crisp design, not mis-aligned stitching, frayed/hanging threads, etc. Buttons all button cleanly. Very pleased
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 24, 2024

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