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 COM100 Waterproof EC/TDS And Temperature Combo Meter

HM Digital COM100 Waterproof EC/TDS And Temperature Combo Meter

Product ID: 177148819

Details

Brand
HM Digital
Special Feature
Auto Off
Colour
white
Age Range (Description)
Adult
Included Components
Model

⚡0.5 sec rapid response

💧Waterproof design

🔋Rechargeable with 2 AAA batteries

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545 Lei

Duties & taxes included

In stock

Sold byAmazon RomaniaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Stay ahead of water quality with precision and style!

ECO SMART POWER - Rechargeable and powered by 2 AAA batteries, ensuring long-lasting use without frequent replacements.
AUTO OFF CONVENIENCE - Smart auto-off feature preserves battery life so you’re always ready when it counts.
COMPACT LIGHTWEIGHT - Sleek, portable design (only 120g) fits perfectly in your toolkit or pocket for on-the-go testing.
BUILT FOR EVERY ENVIRONMENT - Fully waterproof construction means reliable performance indoors or outdoors—rain or shine.
PRECISION AT YOUR FINGERTIPS - Digital display delivers instant, accurate TDS and temperature readings in just 0.5 seconds.

The HM Digital COM100 is a professional-grade waterproof TDS and temperature meter designed for fast, accurate water quality testing. Featuring a digital display with a lightning-fast 0.5-second response time, rechargeable power via 2 AAA batteries, and an auto-off function, it’s perfect for both indoor and outdoor use. Compact and lightweight, this tool ensures you never miss a beat in monitoring water purity.

Specifications

ASIN	B0045LQFTK
Age Range (Description)	Adult
Age Range Description	Adult
Best Sellers Rank	#55,235 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #120 in Conductivity Meters & Accessories
Brand	HM Digital
Brand Name	HM Digital
Colour	white
Country of Origin	Korea, Republic of
Customer Reviews	4.3 out of 5 stars 172 Reviews
Display Type	Digital
Global Trade Identification Number	00891144000007
Importer Contact Information	hm digital
Included Components	Model
Indoor Outdoor Usage	Indoor, Outdoor
Item Length	18 Centimetres
Item Type Name	tds meter
Item Weight	120 Grams
Manufacturer	HM Digital, hm digital
Manufacturer Contact Information	hm digital
Model Name	COM100
Model Number	COM-100
Number of Batteries	1 A batteries required.
Outer Material	Plastic
Outer Material Type	Plastic
Packer Contact Information	hm digital
Part Number	COM-100
Power Source Type	बटरी सचालित
Product Care Instructions	Hand Wash Only
Response Time	0.5 Seconds
Reusability	Rechargeable
Special Feature	Auto Off
Special Features	Auto Off
Specification Met	TDS
UPC	095225177507 891144000007
Unit Count	1 Count

Reviews

P**R

26.08.2016

B**M

21.06.2025

J**I

15.03.2024

A**S

18.04.2026

A**.

29.01.2020

D**4

31.01.2025

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