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.

Hmdcom100 Waterproof Ec Tds And Amp Temperature Combo Meter

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Description

💧 Stay ahead in water quality—because precision waits for no one!

SPEED MEETS CLARITY - Instant 0.5-second response time with a large digital display ensures you never miss a critical measurement.
PRECISION IN EVERY DROP - High-accuracy readings across four scales (µS, mS, ppm, ppt) keep your water quality insights sharp and reliable.
VERSATILE CONVERSION POWER - Three nonlinear EC to TDS conversion factors (KCl, 442TM, NaCl) tailor your data to exact standards.
BUILT TO BRAVE THE ELEMENTS - IP67-rated waterproof design means no fear of spills, splashes, or outdoor testing challenges.
ENDURANCE FOR PROFESSIONALS - Up to 100 hours of battery life with low battery indicator keeps your workflow uninterrupted.

The HMDCOM100 is a professional-grade waterproof EC/TDS/Temperature combo meter featuring IP67 protection, rapid 0.5-second readings, and versatile measurement scales. Designed for demanding water quality testing in labs, aquaculture, pools, and more, it offers high accuracy, a large digital display, and up to 100 hours of battery life, making it the go-to tool for millennial professionals who demand precision and durability in every drop.

Specifications

ASIN	B0045LQFTK
Additional Features	High Accuracy, Large Display, Waterproof, Low Battery Indicator
Age Range Description	Adult
Age range (description)	Adult
Battery Life	100 Hours
Brand	HM Digital
Brand Name	HM Digital
Color	White/Purple
Colour	White/Purple
Customer Reviews	4.2 out of 5 stars 172 Reviews
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
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
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
Smart Home Compatibility	Not Smart Home Compatible
Special features	High Accuracy, Large Display, Waterproof, Low Battery Indicator
Specification Met	UL
Style Name	Contemporary
UPC	095225177507 891144000007
Unit Count	1 Count
Upper Temperature Range	80 Degrees Celsius

Reviews

A**S

18.04.2026

S**L

24.03.2020

A**H

17.03.2024

B**M

21.06.2025

J**I

15.03.2024

A**.

29.01.2020

D**4

31.01.2025

F**.

8.02.2021

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HMDCOM100 Waterproof EC/TDS And Amp Temperature Combo Meter

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Description

Specifications

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Common Questions