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Product Description: How Pure is Your Water? 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-4 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-4 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-4 is a great tool for drinking water, water filtration and purification, hydroponics (test your nutrients), colloidal silver, aquariums, RO/DI systems, pools and spas, and more.
From the Manufacturer
TDS Tester with Advanced Microprocessor Technology.
Bogdan
Reviewed in Japan on September 3, 2024
4 か月後に動作しなくなりました。電池を交換したのに、電源が入りません。Amazon サービスに電話して、販売者に連絡し、返金してもらいました。動作することを願っていますが、そうでなければ非常にイライラします。実際、Amazon カスタマーサービスが返金手続きをしてくれました。
D.S.Naidu
Reviewed in Singapore on January 8, 2021
I was anxious receiving as there was some positive review. Upon receiving the meter, opened up. To my disappointment, the meter does not work at all. Even after changing new batteries, the meter still does not work. Lost hope to such called budget priced meter
Dan
Reviewed in the United States on July 13, 2017
This TDS meter is perfect for testing your reverse osmosis water to ensure that the membrane is still working properly. I've had this unit for a number of years now, and I use it every 6 months for this purpose when I change the sediment and carbon filters in my RO system. The membrane cartridge in an RO system is the most expensive part to replace, and most of them are rated to last 2-5 years. But how do you know when it's time to replace the membrane? Do you play it safe and just replace it at two years, or do you run "fast and loose" and milk a full 5 years out of it? Well, a TDS meter will tell you exactly how well your membrane is performing. If you replace the sediment and carbon filters every 6 months like you're supposed to, you extend the life of your expensive membrane cartridge. And 5 years is *not* the upper limit. I got nearly 7 years out of my last one, because I use a TDS meter to test it every 6 months at filter-change time. There is no reason to replace the membrane if it can still remove 75-80% of the dissolved solids in your tapwater. There are several good sites that explain the testing procedure in detail, and it's very easy.
Gil
Reviewed in Canada on March 28, 2017
Works as described. Now I know what quality of water we are drinking through our RO system which was the main reason for buying this. Also tells me what the quality of water is out of our main and out of the water softener. A little piece of mind.
Chambolle
Reviewed in the United States on March 20, 2017
I was a bit skeptical, to be honest. But this simple and inexpensive tds meter seems to work. Out of the box, I stuck it in distilled water. It read 1 ppm - accurately, in other words. Water from my tap (from a deep well) read 190 ppm; the same water from a brita filter read 95 ppm; and my Crystal Geyser water from a gallon jug read 65 ppm.I got this to get a general idea of the water quality for my espresso machine, shooting for 75 to 100 ppm to minimize scaling but still have sufficient dissolved solids/minerals for good extraction and to trigger the water level sensor on my dual boiler setup. I now mix the CG jugged water and brita water to hit my targeted range, and check with this meter. Which is easy to do: press the on/off button, stick the business end of the sensor about one inch into the water reservoir on my espresso machine, press the 'hold' button, remove to read, shut it off.Is it accurate enough for mission critical work? Who knows. It does seem consistent enough to help me monitor water quality for my purposes, and for the price, that's plenty good enough.
customer
Reviewed in Mexico on January 13, 2017
Muy fácil de usar, llegó en menos del tiempo indicado.Bastante funcional para el uso que le tengo pensado, que es casero/no industrial (aunque tal vez también funcione para eso, no lo sé).Se ve durable y resistente, de calidad aceptable.
Peter Schneidler
Reviewed in the United States on March 8, 2015
It is very simple to use. Here are the instructions from the packaging:1. Remove the protective cap2. Turn the TDS meter on. The on/off switch is one of the buttons clearly visible on the front of the device below the digital readout.3. Immerse the meter into the water / solution up to the maximum immersion level (2 inches)4. Wait until the display stabilizes. This takes about 10-30 seconds. If you can't read it while this is happening, then push the "hold" button and it will hold the reading after you take it out of the water.Like many others I bought this to test the effectiveness of our reverse osmosis water purification system. Worked for that job perfectly and very easily. I first used it in late Aug 2014 when we hooked up our new system. The tap water was at 118 ppm, the water from a brita pitcher was at 68 ppm, and the RO produced water was 30 ppm. A few days later I did it again and got nearly identical numbers (120, 74, 32). Never touched it again until today, 3/8/15 when the tap measured 119 ppm and the RO-treated water was at 8 ppm. Maybe the filter performance improved after they were used a little bit, not sure. Regardless, this device is very simple, super accurate, and really cheap--what more can you ask for?
tron3
Reviewed in the United States on June 11, 2014
My tap water tested under 170 PPM, which is good. My PUR water filter also tested under 170 PPM. I was expecting much less, but the purpose of the filter is to eliminate some of the chemical substances. The mineral portion of the filter probably put back in some good stuff. Poland Spring bottled water measured in the 60 PPM range. I was glad to see one can get that for which they paid.I wanted to test the rain water one night as it was raining. In haste to get a sample so I could play with my TDS meter, I simply captured some water running out of my neighbor's PVC drain pipe. I expected it to be filthy even though it had rained for a while and must have flushed the pipe. It measured exactly 10 PPM.I did some cross checking with the tap sample and it read under 170 PPM. Dipped it in the rain water, which now became slightly contaminated, and the reading became 11 PPM. This item certainly works. I would probably start drinking rain water if I had a PH tester and means of capturing rain water cleanly. Just no real space to do so.I dinged it for lack of a comparison chart, which I found on the web. Really, how much would a plastic card add to the price of this thing? Could also be printed on the back of the unit. Also dinged for not having a Fahrenheit scale.An official water testing cup would be nice. I used an old semi-translucent liquid detergent cap. They tend to be water repellent so the detergent runs out of the cup. That means less contamination from sample to sample because no water dropletes stick. Just pour and shake.Addendum:Over Father's Day weekend I went to my sister's and checked her tap and filtered 'fridge water. Little surprised to find her surburban water readings in the 270 range, or higher. I always felt her water tasted different, but she simply dismissed the results.
Darius
Reviewed in the United Kingdom on December 23, 2014
Very good quality. I recommend.
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