Shopping Cart

TDS & EC Meter 2.0

Easy to Use Digital Water Tester


  • Fast shipping from an Amazon fulfilment centre near you
  • 30 day money-back guarantee
  • 100% safe and secure checkout

Check Water Purity From Home in Seconds. Test PPM, EC, and Temperature (°C & °F)

TDS (Total Dissolved Solids) tells you the amount of dissolved solids in a water sample. You can determine the effectiveness of your RO, DI, or distillation unit, check the nutrient levels of your hydroponic setup, and more.

Instead of forking out for an expensive lab test or professional equipment, you can get reliable results from home. Even though non of the TDS meter can replicate the accuracy of an expensive laboratory instrument, it’s ideal for getting a close estimation.

The great thing about this meter is that it works for almost any type of water testing you have in mind:
• Private water sources like wells;
• RO, DI, or distillation unit effectiveness;
• Nutrient levels in hydroponic setups;
• Aquariums or fish tanks;
• Swimming pools, hot tubs, and spas;
• General water quality trends;
• And much more

All our products are stored in Amazon Fulfilment centres to be able to deliver them to you quickly and reliably. Please allow us 1 day to process your order and 5-7 days to receive it. Some orders will arrive even as fast as 3 days but the logistics and shipping speed is not something we can control.

Easy to use, easy to read

Accurate and reliable

Works out of the box

A TDS reading may give an early warning to deteriorating water quality that could otherwise go unnoticed.

The EPA recommends treatment when TDS concentrations exceed 500 parts per million (ppm). With a TDS reading above 500 ppm, you may notice aesthetic effects such as deposits, colored water, staining, and/or salty taste.

Measuring the TDS is crucial when you grow plants in a hydroponic system. Get it too high and you could be putting your plants at risk of toxic nutrient levels. Get it too low and you run the risk of nutrient deficiency.

In aquarium or fish tank water, a constant level of minerals is necessary for aquatic life. However, concentrations too high or low may limit growth and lead to the death of fish.

Get Your Results in Seconds

No calibration or setup needed - use it straight out of the box

Just dip in the meter, stir, and check your results in seconds

Save time, money, and hassle over testing at a lab

Upgraded Accuracy That Lasts

Get almost exact readings every time

Easily recalibrate for extended precision

Closest thing to lab-quality results from home

Results That Anyone Can Understand

Includes free guide explaining the results and TDS in general

Get all your questions answered by our EPA water expert

Check PPM, EC, or temperature on the clear backlit LCD screen

digital water quality meter

Dip the meter in your chosen water source or liquid

digital water quality meter

Gently stir the meter to remove any air bubbles

digital water quality meter

Wait for the readings to automatically lock, then read the results


TDS: 0-9999 ppm
Conductivity: 0-9990 μs/cm
Temperature range: 32-176°F and 1-80°C.
Battery: 1 x 3V Button Cell CR2032
Conversion factor: NaCl

What people are saying

Works great! Very easy to use, matched my neighbours professional laboratory analysis

John F. Bell

The box includes

1 x TDS Meter

1 x Leather Pouch

1 x Instructions


  • Fast shipping from an Amazon fulfilment centre near you
  • 30 day money-back guarantee
  • 100% safe and secure checkout

Simple testing or money back guaranteed

digital water quality meter

Accurate results that anyone can test for

digital water quality meter

Customer support ready to help with testing and reading the results.

digital water quality meter

30-day complete satisfaction money back guarantee

  • What kind of water filters can be tested with a TDS meter?

    The only drinking water filters that have an effect on TDS are reverse osmosis (RO), distillation, or deionization filters. The Zero water filter is another word for a deionizing water filter. No other type of filter will significantly reduce TDS. However, you can measure TDS on any drinking water source to get an idea of the TDS level.

  • Can I use the TDS meter to test reverse osmosis water?

    Yes. Water treatment professionals use our TDS meter to monitor the status of the RO membrane in home and commercial filter systems. You can do it too. First, measure the TDS of unfiltered water. Then measure the RO water. The RO should be removed at least 90% of the TDS. Most people replace the RO membrane when the RO removes about 70% of the TDS. If your RO has an activated carbon post-filter, it may add some minerals back into the RO water. This can increase the TDS a little bit when the post-filter is first put into service.

  • Does it also measure water temperature?

    Yes. The meter displays both °F and °C

  • What temperature was used to calibrate this TDS meter?

    77°F (25°C). This is the universal temperature for calibration.

  • What kind of batteries does it come with? Can they be replaced?

    1 x 3V Button Cell CR2032 (can be easily replaced).

  • Does it test for ph?

    No. This meter measures total dissolved solids (TDS) only.

  • Can I use a TDS meter to test for water hardness?

    While water hardness is a component of the total TDS measurement, it is not a water hardness test. ppm TDS is not the same as ppm water hardness. A water hardness test kit is designed for measuring calcium and magnesium minerals only. If you need water hardness test strips, you can find the Health Metric test strips here.

  • Can I use it to check my water softener?

    No. Water hardness minerals are detected by TDS meters, along with will all other minerals and salts. Also, ppm TDS is not the same as water hardness ppm. They are different parameters. You need the Health Mettric water hardness test strips for this!

  • Can I use the ppm meter for hydroponics?

    Yes. The meter is perfect for measuring nutrient solutions. Note! This meter reads EC in microsiemens (uS). Some hydro fertilizers use millsiemens (mS). 1000 uS = 1 mS.

  • Can I re-calibrate this meter if needed?

    Yes. It is fast and easy. The instructions come with the meter.

  • How often do I need to clean the probe and how to do it?

    After each use, rinse the probe in clean or distilled water. Then let the probe air-dry.

  • Can I calibrate the meter to zero ppm with distilled water?

    No. TDS meters work by measuring electrical conductivity and converting it to TDS. Since distilled water won't conduct a current it will always read zero ppm, even if the meter is not calibrated properly. You must calibrate using a calibration solution based on its NaCl level.

  • Can I measure the salt in my marine aquarium?

    No. You'll need a specialty TDS meter that can read over 10,000 ppm. A refractometer is more accurate and easier to use for this particular application.

  • What's the diference between TDS and salt meters?

    TDS and salt meters are essentially the same meters. They work by measuring electrical conductivity (EC) in water. EC is converted to either TDS in ppm or an estimated salt level in ppm. A salt meter just runs the calculation for you and displays the estimated salt level as ppm. However, salt meters don't really sense and measure the actual pool salts. It is all based on EC, which is influenced by minerals in the water, certain pool chemicals and the salt you add. Any salt meter, hand-held, at a pool store, or on your system is just estimating salt by measuring EC.

  • Does this meter use the NaCl conversion factor for calibration?

    Correct. It uses the NaCl conversion factor. Look for the NaCl TDS level on the calibration solution when calibrating the meter. Ignore the KCl or 442 conversions, which are also present on most calibration solutions.

  • The TDS did not change after I filtered my water. Why?

    The only type of water filtration that lowers TDS is distillation, reverse osmosis or deionization. Carbon filters, Berky filters, sediment filters, water softeners, and other devices have no significant TDS reduction.

  • I tested bottled water and the meters says the TDS is high. Why?

    Bottled water is a generic term for water packaged in plastic or glass. Many types of bottled water come from the same source as your tap water - underground water supplies. The water may contain minerals and salts that are required to provide taste to the water. Bottled water is not the same as distilled water. Only distilled or reverse osmosis water will have a low or zero TDS level. Remember, TDS is not a measure of "toxins." It is simply the measure of the minerals and salts dissolved in water. Good or bad TDS is relative to what you are using the water for.

  • I tested the water from my Berkey water filter and it's still high. Why?

    Berkey filters remove sediment, fine particles and taste and odor-causing chemicals like chlorine and chloramine. It will remove musty odors caused by natural organics like geosmin. However, this filter does not remove a significant amount of dissolved inorganic salts and minerals like sodium, nitrate, calcium, etc. Therefore you should see little or no reduction in TDS with this type of filter.