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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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

Brand	HM Digital
Special Feature	Auto Off
Colour	white
Age Range (Description)	Adult
Included Components	Model
Outer Material	Plastic
Specification Met	TDS
Display Type	Digital
Product Care Instructions	Hand Wash Only
Net Quantity	1 count
Power Source	बटरी सचालित
Model Name	COM100
Number of Batteries	2 AAA batteries required.
Response Time	0.5 Seconds
Reusability	Rechargeable
Indoor/Outdoor Usage	Indoor, Outdoor
UPC	095225177507 891144000007
Global Trade Identification Number	00891144000007
Manufacturer	HM Digital
Model number	COM-100
Item Weight	120 g
Product Dimensions	22.61 x 7.37 x 5.33 cm; 120 g
Batteries	2 AAA batteries required.
Item model number	COM-100
Item Height	2.1 Inches
Item Width	2.9 Inches
Voltage	3 Volts
Are batteries included?	No

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