How many times can the tester be used?

FROM HM DIGITAL: Unlimited. Eventually, you will need new batteries, but the TDS-EZ can be used an unlimited number of times.

What temperature was this device calibrated at? I noticed that readings vary with temperature. How do I get a consistent reading?

FROM HM DIGITAL: The TDS-EZ was calibrated at 25 degrees Celsius (77F), but more importantly, the TDS-EZ is one of HM Digital's most basic meters and does not have Automatic Temperature Compensation (ATC). Therefore, since it does not have ATC, you will see discrepancies when testing hotter or colder from the baseline of 25C/77F.If your water is typically around this temperature, it won't be much of a difference, but if +/-10 degrees or more from 25C/77F, it's a good idea to get a meter with ATC, such as HM Digital's TDS-3, TDS-4, AP-1, COM-80 or COM-100.

can the battery be replaced? if so, what battery does it take?

Yes, the batteries can be replaced. It takes 2 LR44G "button cell" batteries like the batteries that go in watches, ect. The unit has an auto shut-off so the batteries should last a good long time.

Can this be used to check for collodial silver in the 10 ppm range in a solution of distilled water?

No it can't. It doesn't detect specific elements or chemicals. Though the way calcium, lead, and collodial silver may dissolve would effect the numerical value of TDS and if you knew that in 100 ml of 45 deg Celsius water would only hold X# ppm of an element you might be able to figure it out based on the numerical value shown.

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HM Digital blue 0-9990 ppm Measurement Range, 1 ppm Resolution, 3% Readout Accuracy, TDS-EZ Water Quality TDS Tester, TDS-EZ

HM Digital blue 0-9990 ppm Measurement Range, 1 ppm Resolution, 3% Readout Accuracy, TDS-EZ Water Quality TDS Tester, TDS-EZ

Product ID: 249196335

Details

Brand
HM Digital
Capacity
9999
Colour
blue
Item dimensions L x W x H
25 x 32 x 155
Material
Plastic

📊3% readout accuracy

📏0-9990 ppm range

🔋1000 hrs battery life

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Description

💧 Stay ahead of water quality—because pure water is the new luxury.

DURABLE STYLISH - Translucent blue, rugged housing combines modern aesthetics with long-lasting durability for everyday use.
USER FRIENDLY DESIGN - Large, easy-to-read LCD screen with hold function to save measurements for effortless recording and analysis.
EXTENDED BATTERY LIFE - Up to 1000 hours of continuous use powered by included LR44 batteries—reliable performance without frequent replacements.
SMART POWER MANAGEMENT - Auto-off feature conserves battery by shutting down after 10 minutes of inactivity—eco-conscious and efficient.
PRECISION AT YOUR FINGERTIPS - Advanced microprocessor tech delivers accurate TDS readings with 3% accuracy for confident water quality checks.

The HM Digital TDS-EZ is a compact, highly accurate water quality tester with a broad 0-9990 ppm measurement range and 1 ppm resolution. Featuring a large LCD, hold function, and auto-off power saving, it offers up to 1000 hours of battery life powered by included LR44 cells. Its durable translucent blue casing and easy recalibration make it an essential tool for professionals and enthusiasts monitoring water purity in filtration, hydroponics, aquariums, and more.

Specifications

ASIN	B002C0A7ZY
ASIN	B002C0A7ZY
Batteries	2 LR44 batteries required. (included)
Brand Name	HM Digital
Capacity	9999 Picoliters
Color	blue
Customer Reviews	4.4 4.4 out of 5 stars (7,369)
Customer reviews	4.4 4.4 out of 5 stars (7,369)
Date First Available	7 August 2012
Global Trade Identification Number	00891144000168
Included Components	meter
Is Discontinued By Manufacturer	No
Item Dimensions	25 x 32 x 155 millimeters
Item Type Name	meter
Item model number	TDS-EZ
Manufacturer	HM Digital, Inc.
Manufacturer	HM Digital, Inc.
Manufacturer Part Number	TDS-EZ
Material Type	Plastic
Model Number	TDS-EZ
Product Dimensions	2.54 x 3.18 x 15.49 cm; 41 g
Size	0-9990 ppm. Measurement Range
UPC	712641079917 891144000168
Unit Count	1 Count

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