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HM Digital TDS-EZ Water Q... has been added to your Cart
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  • HM Digital TDS-EZ Water Quality TDS Tester, 0-9990 ppm Measurement Range , 1 ppm Resolution, +/- 3% Readout Accuracy
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HM Digital TDS-EZ Water Quality TDS Tester, 0-9990 ppm Measurement Range , 1 ppm Resolution, +/- 3% Readout Accuracy

1,628 customer reviews
| 178 answered questions

List Price: $25.95
Price: $14.59 & FREE Shipping on orders over $35. Details
You Save: $11.36 (44%)
In Stock.
Ships from and sold by Amazon.com. Gift-wrap available.
Purple
  • 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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45 new from $14.59 8 used from $11.67
$14.59 & FREE Shipping on orders over $35. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

HM Digital TDS-EZ Water Quality TDS Tester, 0-9990 ppm Measurement Range , 1 ppm Resolution, +/- 3% Readout Accuracy + APEC - Top Tier - Built in USA - Ultra Safe, Premium 5-Stage Reverse Osmosis Drinking Water Filter System (ROES-50)
Price for both: $213.59

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Color: Purple

Product Information

Color: Purple
Technical Details
BrandHM Digital
Modeltds ez
Item Weight2.2 ounces
Product Dimensions1 x 1.2 x 6.1 inches
Item model numberTDS-EZ
Batteries:2 Nonstandard Battery batteries required. (included)
Manufacturer Part NumberTDS-EZ
  
Additional Information
ASINB002C0A7ZY
Best Sellers Rank #82 in Home Improvement (See top 100)
Shipping Weight2.4 ounces (View shipping rates and policies)
Domestic Shipping Item can be shipped within U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Date First AvailableApril 4, 2006
  
Warranty & Support
Warranty, Parts: Parts
Feedback
 

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.


Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

429 of 440 people found the following review helpful By John A on December 29, 2012
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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176 of 179 people found the following review helpful By JC Perry on March 27, 2014
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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207 of 214 people found the following review helpful By ReynerN on June 28, 2012
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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191 of 215 people found the following review helpful By Klystron on June 1, 2010
Color: Purple
Worked perfectly right out of the box.

I did a quick control test with three different waters right after turning it on the first time.

My one-minute test results:

Distilled pure water = <1 ppm
Plain tap water = 64 ppm
Sports water (Propel) = 260 ppm

I also received the unit within a couple of days, very prompt.
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112 of 126 people found the following review helpful By alyson on March 22, 2010
Color: Purple Verified Purchase
inexpensive and works every time. no calibration or battery changes needed in the ~6 months I've had it.
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79 of 89 people found the following review helpful By Michael Fields on February 20, 2011
Color: Purple Verified Purchase
This is a great unit, as soon as I got it my tap water in Vegas was 435 which is VERY high, so I tested some bottled water and it was 12, then I went a tested a few different outside water vendors and found a few that are better then bottled water, I have read a bunch of articles and they all way you should drink water 0-50 the lower the better as higher water levels are bad for you. This unit is great as pour a little in (DO NOT PUT THE WHOLE UNIT IN THE WATER, JUST UP TO THE WATER LINE) press the on button and read what it says on the large digital display, if you can not see it in the water, push the second button which will hold the reading so you can take it out of the water to read it.
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148 of 173 people found the following review helpful By Ziminy13 on June 14, 2010
Color: Purple
I've had this for about 6 months now.
I use it daily.
It's always accurate.
Never had a problem.
The auto shut-off is fantastic.
I'm very forgetful.
Even with all this use, It has not needed a battery change.
I use a lot of meters and this one is by far the most worry free of them all.
I would definitely buy this again.
TOTAL WIN!
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34 of 37 people found the following review helpful By sirbenzo9 on June 4, 2011
Color: Purple Verified Purchase
Just turn it on, dip it in the water for about five seconds and the same result every time. It made Ppm very easy to understand. Just get the NaCI 342 Ppm calibration liquid for the future. You will hardly have to use it. just dip the meter in the fluid and wait until the meter reads 342. It's solid also.
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HM Digital TDS-EZ Water Quality TDS Tester, 0-9990 ppm Measurement Range , 1 ppm Resolution, +/- 3% Readout Accuracy
This item: HM Digital TDS-EZ Water Quality TDS Tester, 0-9990 ppm Measurement Range , 1 ppm Resolution, +/- 3% Readout Accuracy
Price: $14.59
Ships from and sold by Amazon.com