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A TDS meter is an inexpensive and convenient digital tool to instantly check your overall water quality.

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2 years warranty

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Not waterproof

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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 ideal 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.

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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 Asked Questions

  • Can this be used to check for collodial silver in the 10 ppm range in a solution of distilled water?

    Yes, any of our TDS meters can be used for checking colloidal silver in any range (up to the meter's max). Since distilled water will be virtually devoid of TDS and register 0 ppm (potentially 1 or 2 ppm), if you add 10 ppm of colloidal silver to the water, it will show as 10 ppm on the meter. One thing to note is that the TDS-EZ is one of our most basic TDS meters and does not have ATC (Automatic Temperature Compensation), which means it will not automatically compensate for temperature discrepancies off the baseline of 77F (25C). For everyday drinking water testing, this is not an issue, but for sensitive testing, it can be. Therefore, if the water will be much hotter or colder than 77F, it's suggested to get a more advanced meter, such as HM Digital's AP-1.

  • How many times can the tester be used?

    This TDS tester is an electronic device that can be used indefinitely. It has two metal probes that are submersed in water when taking a measurement. After the test is completed, excess water is shaken off of the probes; and a protective cap is replaced to protect the probes from handling damage. There are no consumable parts to this tester, other than batteries. With careful handling, this device should probably last several years. The most probably reasons for it to quit functioning would be breakage from dropping onto a hard surface (e.g., kitchen floor), submersion from dropping the device into water, or the batteries going dead from use or long storage, in which case the batteries could be replaced.

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