TDS Meter Digital Water Tester - ppm Meter, EC & Temperature Test Pen 3-in-1 | Easy to Use Water Quality Tester | Ideal for Testing RO Drinking Water Hydroponics Aquarium Swimming Pool & More (Green)

This little water tester is simple to use, and very nice. It comes with a cute vinyl case, and then you just pop off the plastic probe cover. You use a clean cup or glass that has been rinsed with running water from the source you are testing. You set the pronged part of the probe into the water, about an inch deep. The unit is not waterproof, so don't submerge the whole thing. The digital reading is immediate. We measured the water directly from our tap, and then with a Culligan water filter on the faucet, and then measured the water from our filtered water dispenser in our Whirlpool refrigerator. We had gotten a call from our water utilities company saying that they were increasing the chemicals in our water for this month; not sure why, but this may be related to the hurricane that came through our area this fall. However, I was feeling very concerned about the quality of our water, even though the filtered water tasted fine. Our water from the tap tests at about 200 ppm, and it's about 80 points lower with filtered water. The readings vary slightly with each different water sample. I am also going to use this water tester to see when it is getting to be time to change the water filters. Our son has a different water tester, and he brought his over to compare. His tester came out with almost exactly the same numbers as this one that we are using. Using this water tester was reassuring, and it works consistently, and is easy to use.

Got one on Little Tech Girl’s recommendation. Working out fantastically for measuring the nutrients in my Aerogarden type of hydroponic units. While you can’t go wrong using Aerogarden’s nutrients in the manner they advise, I appreciate being able to know exactly what the nutrient situation is at any given time in all my units.

Pretty good very accurate might be off by a couple ppm max I would say 2 but I get a good reading from my osmosis system I know when it's time to change my filters it's also very simple to use made of good plastic put pretty sure if you strap on it it might break and it looks like if you drop it it it'll survive more than a couple drops over very good for the price 👍

No need to calibrate it, because it came calibrated. Works for me, I have nothing to compare it to but as a beginner in hydroponics it is getting the job done for me.

Bought this test kit and a chemical strip test kit. So far, both this tester and the chemical tester are in complete agreement for all water i've tested. Quick and easy.

I can't tell how accurate this device is but it looks and feels cheap. Probably for this price it's ok but I have my old "stick" which way better quality.

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) device2nd column: Pro Digital temperature reading3rd. column: Pro Digital TDS reading3rd column: TDS-EZ TDS readingtemp pro digital TDS-ezactual read tds tds53F 53F 265 23057F 57F 262 24169F 68F 271 29279F 77F 286 33393F 91F 292 371As 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).

This was my second purchase of an EC meter, and it's dramatically better than the first one. It is easy to use: I pull a small sample of a few ounces of water from my iDoo 12 pod hydroponic garden using a turkey baster, put it into a glass (see photo) and in seconds it give me an EC reading in microsiemens/cm. It has automatic temperature adjustment and needs only seconds to produce an accurate digital reading. I don't know what else you could expect for this price. This greatly simplifies nutrient control in my herb garden.

When you power it on, even if it was only off for a minute or so, it defaults to "ppm" instead of the last mode you were using. Apart from that it seems fine. It's a good value for the money. I'd recommend it to anyone who wants to check "ppm", "ec" and "temperature" and not spend much money.It's quite easy to use nonetheless. The instructions are pretty clear too.

Comes ready to use - with battery installed - plus for seller . Best used for water : filter, hardness, aquaculture, hydroponics, pools.MY USE: Bought for home / to test the efficiency of a Brita water filter . Been drinking tap water , deemed safe for drinking by the city. Bought a over the counter water filter and wanted to see the difference - if any . A TDS range from 50 to 150 is best for drinking. Pic 5/6 show the readings of 'carbon filter water' and 'tap water'.IN BOX:: Comes with a carry case , and protective cap for electrodes . Dual electrodes measure .pic 4 Illustrated usage manual - with pics . Nice touch. - Would have liked a bit more detail on EC/TDS standards- But they have a website for more info.Easy to change battery - the battery cap slides out easily- and pull the battery . Pic 3 . Battery is CR 2932- easily and cheaply available .TIPS-- keep the liquid below the immersion line , yet above the reading marker . pic 7- always keep the electrode cap on to avoid damaging the prongs.- testing 2 separate liquids , shake off the previous liquid completely bef inserting the tester into a new liquid - this will give accurate readings.hope this helps!

Fantastic product, does have a slight discrepancy when measuring samples twice out three times but maintains an accurate tight range. I certainly don’t regret the buy. Very good product, very good.

UPDATE: contacted tech support and they provided a replacement unit which they specifically checked for higher ppm operation. That’s definitely good customer service. The replacement unit actually worked out well for me. That said, temperature compensation doesn’t really work as readings are HEAVILY dependent on sample temperature. Also, the temperature measurement function is also painfully slow to converge (several minutes). My target application is in a narrow temperature range so I simply calibrated the meter at the center of that range. Added 2 extra stars. One for customer service and another for the performance improvement of the replacement.ORIGINAL:The good: Reads a 350ppm calibration solution to +/- 10 ppm out of the box.The bad: The meter can’t seem to be calibrated to read above 2250ppm when calibrating in a 3000ppm calibration solution. My application requires measurements in the 2500-3500 ppm range. The claimed calibration capability and 0-9999 range seem widely exaggerated. Tech support suggested warming the sample around 75-78°F which did improve things a little but that's totally impractical in a non-lab environment and the result was still not accurate enough for any kind of use beyond "rough idea"/approximate measurement. Furthermore, the temperature reading is very inaccurate (-4.5°F for my unit) AND takes minutes to stabilize. That casts doubt on the claimed "temperature compensation" effectiveness.Bottom line: I don't have a better device to compare it against but for me, this device is of no value.Sgt Wilko