Features:

  • ✅ QUICK AND EASY TO USE - Measure your water quality within seconds. Simply dip the meter into the water, gently stir, and lock the results on the screen. Our easy to follow instructions make this factory calibrated TDS meter super convenient to use, whether at home or on the go.
  • ✅ UP TO 20% BETTER ACCURACY: The advanced 3-in-1 smartpen combines TDS, EC, and a temperature meter for improved accuracy. With an Automatic Temperature Compensation and the measuring range of 0-9999 ppm +/- 2%, it is an extremely handy device to have around.
  • ✅ FREE TDS E-BOOK: As a special thank you, we will send you a free "TDS Testing Guide" (PDF) including useful tips and insights from qualified water experts. This will help you navigate the world of TDS testing with an ease.
  • ✅ EXCELLENT VALUE - Our TDS meter provides a cost-effective way to regularly measure the effectiveness of RO/DI systems, water quality in pools and aquariums, hydroponic nutrient balance and much more. The strong Titanium alloy probe keeps it functioning for years to come.
  • ✅ DEDICATED TEAM OF EXPERTS - You can always count on our team of EPA experts, with more than 30 years of expertise in the water quality industry. If you have any questions or problems, simply get in touch with us and we'll help you get it right.
Great product, great service, and an affordable price!

I bought the TDS/EC Meter in order to test the purity of distilled and/or bottled water, both at home and my work environment. The added features of temperature and electric current measurement is very useful as well, and was the reason I chose the TDS/EC over other devices. This product works as advertised, is simple to use, and gives consistent results. The company that makes the TDS/EC, Health Metric, is very proactive and communicative with the buyer, in making sure that you are pleased with the product. I really appreciate that. I received emails from one of the company owners which included PDF files with a more complete instruction on the use and care of the device. Great service from them, and I feel confident that if I run into an issue, or just have questions about other uses of this device, I will be taken care of by them.

Excellent Product

These people have asked for a review for a while now, but I have resisted because I had no way to test the reliability of the instrument. I bought 3 inexpensive ($10 - $18) meters, including this one, and they ALL read differently. Consequently I refused to review this meter. Now, however, I can. I bought a bottle of 342ppm Standard Saline solution and discovered that the other two meters were WAY off but THIS one read 341ppm ... entirely withing spec. I also discovered that if it hadn't been spot on there is a calibration screw under the faceplate. So... now I can highly recommend this meter and I use it every week to test my Hydroponics.

Buy this TDS meter!

Aloha! I am very pleased with my purchase of this TDS ppm meter from Health Metric. Having an engineering background, I needed a meter to check my TDS in my Reverse Osmosis machine as well as my tap water and Ionized water. First let me say this gives me a very good indication when to change my filters on these machines as well as knowing what I need to do for my organic garden plants etc. Thank you very much for a fine product. I would certainly recommend anyone thinkin' about purchasing a meter of this type to do so! Keoni

I have been monitoring my RO system and have gained a good understanding of my water system

I received my TDS meter an have been impressed with how user friendly it is. I checked its operation in bottled distilled water to gain confidence in calibration. I have used it for two weeks and believe it is accurate in the readings. I have been monitoring my RO system and have gained a good understanding of my water system. I received a follow up email from the manufacturer with better more detailed information on how to use this meter. Very informative. I recommend this meter and company.

Small problem, but GREAT customer service.

i purchased this to measure the salt level in my pool. The salt level reading is pretty much the same as the results I have been getting from the pool store water tests, so I'm happy with that. But... The second reading is for temperature. It reads around 45 degrees F when the water temp is actually around 78 degrees F. I contacted the manufacturer of the device through their website. At first I thought they didn't respond, but they did the very next day (but it sat in my spam folder for the past two weeks) stating they found a bad batch and will either replace it or purchase a competitors replacement for me. Well, that shows great customer service to me. I don't care about the temp reading and if it does effect the test results it wouldn't be enough to worry about, there is a wide range between the high and low salt limits, so it's good enough. I gave 5 stars because the problem is small but the companies customer service is great!

Works as advertised - with one exception

I tested the meter in multiple types of water. Distilled water read all zeros (000) as it should. They I tested bottled water and it read 75 ppm, then filtered cold, tap water (Pur canister water filter) which read around 180 ppm. However, I purchased it to test my tap water. Cold tap water, which is supposed to be hard water, read 350 ppm. The hot tap water, which is supposed to be soft water, read 375 ppm. Hmm. I assumed that soft water would have fewer particulates. I really don't think that this is an issue with the meter. Either I have other particulates in my hot water or the byproduct (salt) of the water softener is very high. Question: How do I test for specific particulates? What's making my soft water have more particulates than hard water? I recommend this meter. It is very fast responding (PPM). Just remember to rinse it with distilled water and periodically test it in distilled water. It should read 000. If not, it needs to be cleaned. Follow the manufacturer's instructions for cleaning the probes.

Good Meter, good company!

Works great! very easy to use, matched my neighbors professional labatory analysis of THD's This company also went a little extra and e mailed me complete operating instructions BEFORE I got the meter. That was kind of a wow for me. so many companies are just a company. This guy really wants to succeed. Buy his meter, you wont be sorry. and, If you think I am a company rep, I aint, I am an ol East Texas country boy that loves good stuff!

Excellent meter, very accurate out of the box

This is an excellent and very accurate meter. I tested the following: Distilled (local store brand): 0ppm Home R.O.: 15ppm Roundy's Purified Drinking Water (bottle): 2ppm Tap (cold): 252ppm Tap (hot): 267ppm Well (before iron filter and water softener): 254ppm Tip 1: R.O. reading should be about 1/10 of your tap water reading. Tip 2: Water softeners do not remove any TDS and may actually add to it. Tip 3: Water temp affects TDS readings. Higher temp=higher TDS. The only complaint I have is the included case has a terrible chemical odor and the barcode sticker on the case left behind an outrageous amount of adhesive when removed. I may toss if it doesn't air out or if I can't remove the adhesive.

Accurate enough for the price

I first ordered the TDS-EZ that seems to be so popular and was getting wildly different readings depending on the temperature. The TDS-EZ does not have automatic temperature control (ATC). The Professional Digital TDS meter has ATC even though it does not actually say it on the Amazon page (it does say so in the instructions, see photos). While the ATC works it does not fully compensate for temperature across a wide range, but it's close enough for me monitoring my tap water and RO system output. You can't expect these $10-$20 inexpensive TDS meters to be as accurate as $100 lab grade models! View the product photos and in the last one you'll see a 15% off promo code, don't forget to use it at checkout (I didn't see it before I ordered). This brings the price down to that of other cheap meters. I compared the temperature reading to my lavatools thermowand and it's within 1 degree in the 50F - 70F range, about 2 degrees off over 80F. I didn't care about the temperature feature of the probe but no doubt the temperature reading is used for the TDS temperature compensation calculations so it does affect TDS accuracy. Still, close enough for home use. Here are some readings at various temperatures compared to the non-ATC TDS-EZ: Looks like Amazon strips out extra spaces so the formatting is off. 1st column: lliquid temperature using accurate lavatools thermocouple (not thermister) device 2nd column: Pro Digital temperature reading 3rd. column: Pro Digital TDS reading 3rd column: TDS-EZ TDS reading temp pro digital TDS-ez actual read tds tds 53F 53F 265 230 57F 57F 262 241 69F 68F 271 292 79F 77F 286 333 93F 91F 292 371 As you can see in the normal usage range of 60F-80F the spread is 24PPM whereas the TDS-EZ spread is 92, This meter does take a long time for the reading to stabilize if the liquid is much different than room temperature, I think that is just the nature of thermister based temperature sensing (like my other cheap digital kitchen thermometers that take around 15 seconds to stabilize). I did have to keep swishing the meter around every few seconds until the reading stabilized, probably air bubbles and getting the thermister acclimated. The TDS-EZ read whatever reading it was going to display without much swishing. The meter uses a single common lithium 2032 battery (nominal capacity of 200mah). I measured the meter's current draw and it was 0.5ma when on and 0.1ua when off (negligible), so expect about 400 hours of on time with this. Lithium cells have a shelf life of 10 years or so, you'll probably loose the meter before the battery dies! You can get more info about the meter and company from their site health-metric dot com. I included photos of the instruction pamphlet below. edit 10/23: I measured the TDS of coffee and found that the ATC for higher readings seems to work better in terms of percentage accuracy. I got 1440ppm @98F and 1395ppm @78F. Seems to make sense as the range of this device is 0-9990ppm, tap or RO water reading are at the very end of the range. One more thing, when the hold function is active there is no indication on the display and it seems to go into hold mode automatically after a few minutes (or maybe it's when the reading stabilizes?). Anyway, if your reading seems to not change, take the meter out of the liquid momentarily to make sure the reading goes to zero (and the hold is not active).

Simple and Effective

We bought this unit to easily test our water in our pool....we are going to have a salt pool this year. I did not want test strips and things I had to replace. So I ran across this. I will need to keep the pool in the 3200ppm range....this tool will quickly test that for me. When we first received the unity it was well packaged and in a leather protective case. We tested our normal tap water, bottled water and water from the fridge. Turns out the fridge is not doing much...may need to replace that filter :) Otherwise It was very interesting to see the difference between those waters and distilled water. It seems the tester is testing fine and quick. This summer should be a breeze to keep up with things now that we have this unit. It's not waterproof but we will be careful not to dunk it or fully submerge in the pool. Just the tip! Thanks for a great product and reasonable (very good) price! Time will tell how it lasts.

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