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

4.4 out of 5 stars 3,040 customer reviews
| 386 answered questions

Price: $29.99
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Purple
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  • Economy model that is ideal for end-users. Highly efficient and accurate due to its advanced microprocessor technology.
  • Hold Function: saves measurements for convenient reading and recording.
  • Auto-off function: the meter shuts off automatically after 10 minutes of non-use to conserve batteries. Display: large and easy-to-read LCD screen.
  • Measurement Range: 0-9990 ppm. From 0-999 ppm, the resolution is in increments of 1ppm. From 1000 to 9990 ppm, the resolution is in increments of 10ppm, indicated by a blinking 'x10' image. Fun, translucent blue housing that's very strong and durable.
  • TDS-EZ meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver. Includes a TDS chart sticker on the back of the meter that explains TDS values.
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Frequently Bought Together

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

Color: Purple

Product Description

Product Description: A TDS meter (aka ppm pen, nutrient tester, tds stick) is an inexpensive and convenient digital tool to instantly check your overall water quality. TDS = Total Dissolved Solids, which is any salt, metal or mineral in the water. With the push of a button, the TDS-EZ can tell you your overall water purity level, which will be displayed on the screen in ppm (parts per million). The lower the TDS level, the purer the water, with 0 ppm being pure H2O. The TDS-EZ is great for checking your tap water quality, or knowing when to change a filter. (The meter does not test for biological contaminants.) The TDS-EZ is a great tool for drinking water, water filtration and purification, hydroponics (test your nutrients), aquariums, RO/DI systems, pools and spas, and more.

From the Manufacturer

Water Quality Tester with Auto-off Function.

Product Information

Color:Purple
Product Dimensions 1 x 1.2 x 6.1 inches
Item Weight 0.8 ounces
Shipping Weight 0.8 ounces (View shipping rates and policies)
Manufacturer HM Digital, Inc.
ASIN B002C0A7ZY
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item is not eligible for international shipping. Learn More
Origin United Arab Emirates
Item model number TDS-EZ
Batteries 2 Nonstandard Battery batteries required. (included)
Customer Reviews
4.4 out of 5 stars 3,040 customer reviews

4.4 out of 5 stars
Best Sellers Rank #66 in Home & Kitchen (See Top 100 in Home & Kitchen)
#1 in Industrial & Scientific > Test, Measure & Inspect > Water Quality & Instrumentation > pH Testing
Date first available at Amazon.com April 4, 2006

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Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Color: Purple Verified Purchase
I bought two of TDS-EZ Water Quality Testers and while both are placed in the same glass of water, the one reads 752 ppm and the other 371 ppm. You can only conclude that they have not been calibrated in the factory, as claimed on the packaging.

Photo here:
[...]
Poor show!
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Color: Purple Verified Purchase
Very easy to use and is accurate enough for my needs. Values match the values shown by the tds display on my RO unit's in/out readings to the DI stage.

Update: I have realized that there is a HM Digital TDS-4 Total Dissolved Solids Pocket Size Meter unit available on amazon for just a couple of dollars more than this unit. From what I can gather, the TDS-4 is essentially the same unit but has temperature compensation circuitry that does not exist in the HM TDS-EZ. I did a simple test to see if I could quantify the temperature effect. The effect appears substantial. I am reducing my rating from 5 down to 3. Here are my results using the same sample of tap water at different temperatures:
54 degrees: 220ppm
100 degrees: 404ppm
112 degrees: 434ppm
130 degrees: 540ppm
Plotting this on a graph reveals a linear variation.
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Color: Brown Verified Purchase
I ordered the TDS-4 after reading several reviews on it and other products as well as comparing the specs to its rivals.

I read all the specs for each tester I found and it came down to this TDS-4 and the TDS-EZ. The determining factors were its accuracy and ATC. The TDS-4 has a stated accuracy of +/- 2% as opposed to the +/- 3% of the TDS-EZ. The TDS-4 has ATC (Automatic Temperature Compensation) which comes in handy since water can be different temps. Each had the same hold and auto-off function and read in 1 ppm for the first 999 and 10 ppm for 1000 - 9990.

One disappointment I had with the TDS-4 was that it didn't have a "How pure is your water?" chart on the back like the TDS-EZ. It's not hard to remember what's on the TDS-EZ chart, but would be a nice-to-have. Instead I just remember that 0 to 50 is what my RO system should be at, 50 to 100 are carbon filters, 100 to 200 is hard water, 200 to 400 is average tap water (200 to 300 being marginally acceptable drinking water), and that 500 is the EPA's max level it should be (Source: TDS-EZ chart).

I originally ordered the TDS-4 to test our new RO (reverse osmosis) under counter filtration system (Watts Premier WP-4V). Now for my experience with the TDS-4, when I received the unit from Amazon I immediately tested my RO system first (29 ppm), then my tap (251 ppm), and finally RO water from a local watershop (2 ppm). My RO system was in mid-range of the 0 to 50 acceptable for RO systems, my tap was in the mid-range of acceptable tap levels of 200 to 300, and the water from the watershop was almost pure water.
Read more ›
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Color: Purple Verified Purchase
First, this device works great and it can't get any easier. I did a few tests and the results were consistent. For quality, ease of use, and 2 years warranty, I believe it deserves 5 stars.

The sensors measure the Total Dissolved Solids (TDS), which are the total amount of mobile charged ions, including minerals, salts or metals dissolved in a given volume of water in parts per million (ppm). However, I found out that water from the same source will measure differently when the temperature is different. For example, a room temperature water measured at 150ppm, but 110ppm when cold and 192ppm when hot. I thought its interesting.

I like the fact that in the back of this device, they put this sticker so you don't need to memorize anything:

How Pure is Your Water?
-----------------------
0-50ppm = ideal drinking water
50-100ppm = carbon filters, springs
100-200ppm = hard water
200-400ppm = average tap water
and so on

It also has protective cap to cover the sensors (not shown in the picture). It's factory calibrated and is ready to use, but can be re-calibrated with NaCl using a small Phillip screwdriver. Battery lasts for about 1000 hours and the instructions are clear with reference to the website if more information is needed. Overall, it's a 5 star item. No more guessing now!
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Color: Brown Verified Purchase
I have a reverse osmosis water system for drinking water that's about 3 years old. I was about to replace the filters because the manual says to replace them every 3-5 years. Good thing I ordered this $25 tester. It's about the size of a highlighter pen, has a clear number display, and is super easy to use. You test the water out of the tap then test the water out of the RO system. Divide the RO number by the tap number to get a percentage. As long as it's under 20% you don't have to change the membrane filter. My percentage was 5%, which means I've probably got a few more years before I need to change my membrane!
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Color: Brown
I have found the writeup for HM Digital TDS meter model TDS-4 and TDS EZ is poor in that the distinction between the two TDS meters is not apparent in the Amazon write up. For those who are interested TDS-4 is temperature compensated and TDS EZ TDS reading is not temperature compensated, meaning TDS-4 should give you less variation in TDS readings.

Ok I cannot put the web URL in, Amazon does too good of a job finding that you have put a web link in. I will place the URL location vertical:

tdsmeter.
com/
img/
selectionguide.jpg

Also you should know the TDS-3 does everything the TDS-4 does and it also reads out temperature, TDS-3 is not a slim design though.
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