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

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

Product ID: 79692729

Details

Colour
Purple
Material
Metal
Capacity
9999
Brand
HM Digital
Item dimensions L x W x H
25 x 32 x 155
Item Weight
2 Ounces

📏0-9990 ppm range

🔍1 ppm resolution

⏱️Auto-off after 10 min

¥15940

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Description

💧 Measure purity like a pro — because your water deserves precision.

DURABLE STYLISH - Translucent blue, rugged housing combines modern aesthetics with long-lasting strength.
SMART POWER SAVING - Auto-off feature conserves battery life, keeping your meter ready when you are.
USER FRIENDLY DISPLAY - Large, easy-to-read LCD screen ensures quick, clear results every time.
EFFORTLESS DATA CAPTURE - Hold function freezes readings so you never miss a detail during testing.
PRECISION AT YOUR FINGERTIPS - Advanced microprocessor tech delivers ±3% accuracy for reliable water quality insights.

The HM Digital TDS-EZ is a compact, highly accurate water quality tester measuring Total Dissolved Solids from 0 to 9990 ppm with 1 ppm resolution and ±3% accuracy. Featuring a large LCD, hold function, and auto-off for battery efficiency, it’s perfect for professionals and enthusiasts monitoring tap water, filtration systems, hydroponics, and aquariums. Its durable translucent blue casing and easy recalibration make it a reliable, stylish tool for ensuring water purity.

Specifications

Asin	B002C0A7ZY
Best Sellers Rank	#232,602 in Home & Kitchen (See Top 100 in Home & Kitchen) #2,006 in Water Purifier Accessories
Brand	HM Digital
Colour	Purple
Country Of Origin	USA
Customer Reviews	4.4 4.4 out of 5 stars (7,379) 4.4 out of 5 stars
Enclosure Material	Metal
Global Trade Identification Number	00891144000168
Item Dimensions	25 x 32 x 155 Millimeters
Manufacturer	HM Digital, Inc.
Manufacturer Part Number	TDS-EZ
Manufacturer Warranty Description	Contact seller of record
Model Number	TDS-EZ
Outputcapacity	9999 picoliters
Size	0-9990 ppm. Measurement Range , 1 ppm Resolution, +/- 3% Readout Accuracy
Unit Count	1 Count
Upc	712641079917 891144000168

Reviews

User

Nice product

Nice

2.05.2019

User

Five Stars

Good quality.

16.11.2017

User

SinoWare Probador digital de TDS,

...La calidad del producto buena, bonito ...todo en general me gusto Gracias!

13.02.2024

User

ممتاز

26.04.2025

User

Buen y preciso testaje del agua.

Es algo caro pero funciona perfectamente.Lo compré para testar el agua del grifo y el agua que sale de la osmosis inversa. También sirve para medir cualquier tipo de aguas , piscina , acuarios etc...

1.06.2026

User

Très satisfait

Produit conforme, arrivé rapidement...Facile d'utilisation.Je n'ai pas pu tester sa précision mais les résultats fournis sont cohérents avec les médias testés

31.05.2022

User

Seems good

Seems good for the price and I presume reasonably accurate - measured 180 ppm in my tap water, which is about what I expected for semi hard water and 15 for my new RO filter water. Useful to check if my RO filter is remaining effective (or not) over time.This ez version seems intended for retail customers and has a useful sticker on it indicating what different TDS levels mean.

14.12.2025

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¥15940

Duties & taxes included

In stock

Sold byAmazon JapanDelivered 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 Japan.

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TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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