Can this unit be used to test PH?

FROM HM DIGITAL: The COM-100 is NOT a pH meter. It measures EC (electrical conductivity), TDS (total dissolved solids) and temperature. For pH, please purchase HM Digital's PH-200. For more information, please visit www.tdsmeter.com

My meter want read over 999 or am I looking at the wrong ppm?

Select 442 scale. Your meter will read more than 999 ppm.

Any trouble measuring in mS?

FROM HM-DIGITAL: The COM-100 is a professional waterproof EC/TDS meter that has three EC-TDS conversion factors and selectable modes allowing you to measure in the µs, mS, ppm and ppt scales. For more information, please visit, www.tdsmeter.com/products/com100.html

Isn't one supposed to use calibrating and cleaning solution with this?

I clean mine with a wet Q-tip. There is a TDS calibration solution I use when I recalibrate every month.

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HM Digital HMDCOM100 Waterproof EC/TDS And Amp Temperature Combo Meter

HM Digital HMDCOM100 Waterproof EC/TDS And Amp Temperature Combo Meter

Product ID: 269852632

Details

Age range (description)
Adult
Brand
HM Digital
Colour
White/Purple
Included components
HM Digital And
Special features
High Accuracy

⚡Measures EC, TDS & Temp Combo

💧IP67 Waterproof Housing

⏱️0.5s Fast Response Time

$U5513

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Description

💧 Stay ahead of water quality with precision that flows as fast as you do!

LONG LASTING POWER - Up to 100 hours of battery life with low battery indicator keeps you testing without interruption.
TRIPLE PARAMETER MASTERY - Simultaneously measures Electrical Conductivity, Total Dissolved Solids, and Temperature for comprehensive water quality insights.
PRECISION MEETS DURABILITY - Waterproof IP67 design ensures reliable use in any environment, from labs to outdoor aquaculture.
INSTANT READINGS ZERO WAIT - Ultra-fast 0.5 second response time means no more waiting—get precise data when it matters most.
CUSTOMIZABLE CONVERSION FACTORS - Three nonlinear EC to TDS conversion modes (KCl, 442TM, NaCl) for tailored accuracy across applications.

The HM Digital HMDCOM100 is a professional-grade, waterproof EC/TDS/Temperature combo meter designed for fast, accurate water quality testing across diverse applications including hydroponics, labs, and environmental monitoring. Featuring IP67 waterproof housing, three customizable EC to TDS conversion factors, and a rapid 0.5-second response time, it delivers reliable data with a large digital display and up to 100 hours of battery life—perfect for the proactive professional who demands precision and durability.

Specifications

ASIN	B0045LQFTK
Additional Features	High Accuracy, Large Display, Waterproof, Low Battery Indicator
Age Range Description	Adult
Brand Name	HM Digital
Color	White/Purple
Customer Reviews	4.2 4.2 out of 5 stars (176)
Display Type	digital
Global Trade Identification Number	00891144000007
Immersion Depth	1 Meters
Included Components	HM Digital HMDCOM100 Waterproof EC/TDS And Amp Temperature Combo Meter
Indoor Outdoor Usage	Outdoor
Item Length	8.9 Inches
Item Type Name	HM Digital HMDCOM100 Waterproof EC/TDS And Amp Temperature Combo Meter
Item Weight	120 Grams
Manufacturer	HM Digital
Model	COM-100
Model Name	HMDCOM100
Number of Batteries	1 A batteries required.
Outer Material	Plastic
Part Number	COM-100
Power Source	Battery Powered
Product Care Instructions	Wipe Clean
Resolution	0.1 degree fahrenheit
Response Time	0.5 seconds
Reusability	Rechargeable
Specification Met	UL
Style Name	Contemporary
UPC	095225177507 891144000007
Unit Count	1 Count
Upper Temperature Range	80 Degrees Celsius

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$U5513

Duties & taxes included

In stock

Sold byAmazon UruguayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Uruguay.

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