Water Testing

Water Testing

Water Testing, TDS Meters and Test Supplies

Check your water quality. Check total dissolved solids in RO systems to see if it is time to change the RO membrane.

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  1. ITS - Lead Test Kit -1000
    Lead Water Test Kit - Easy to Use In-Home Water Test Kit for Lead - 487997
    This fast screening test kit contains 2 tests with everything needed for accurate results of unsafe lead levels. With reliable results in only 10 minutes, this test kit clearly gives results confirming Lead in water and conforming to the EPA guideline of 15 ppb (µg/L). The kit can test water quality from various sources including faucets, wells (ground water), and home purification systems. Learn More
    $29.99
  2. ITS-5in1-50- 1000
    ITS 5 in1 Water Test Kit - 5 Way Water Testing
    5-Way Water Check reports results for Free Chlorine, Total Chlorine, pH, Total Alkalinity & Total Hardness. ITS # 480015 UPC #809762800152 Learn More
    $19.99
  3. 3M  6-in-1 Water Test Kit -Simple to Use - DIY In Home Water Quality Test Kit
    3M 6-in-1 Water Test Kit -Simple to Use - DIY In Home Water Quality Test Kit
    6 in 1 Home Water Test Kit by 3M. Use this 3M DIY water quality test for convenient on-site testing. The 3M DIY water quality test kit provides quick analysis. Learn More
    $15.75 Special Price $12.99
  4. ITS-pH-Alkalinity-50-1000
    pH Alkalinity Water Tests - Easy to Use In-Home - 50 Tests in One Bottle
    pH & Total Alkalinity test strips are designed for both measurements. Gives reproducible results for each test separately. ITS # 480005 UPC #809762800053 Learn More
    $19.99
  5. ITS-Iron-25-1000
    Iron Test Water Testing Kit - Easy to Use In-Home - 25 Individual Test Strips
    Ida's Iron Check is designed to specifically react with iron, without interference from other heavy metals that may be present. ITS # 481046 UPC #809762810465 Learn More
    $27.99 Special Price $19.99
  6. ITS-Hardness-50-1000
    Water Hardness Test Kit - 50 Individual Water Tests
    Total Hardness test strips offer a wide range of detection and calibrated to be both accurate and sensitive. ITS # 480008 UPC #809762800084 Learn More
    $19.99
  7. ITS-Copper-25-1000
    Copper Water Test Kit - 25 Tests per Bottle
    John's Copper water test is an alternative to wet chemical copper tests. Quick results are obtained in less than 1 minute ITS # 480042 UPC #809762800428 Learn More
    $27.99 Special Price $19.99
  8. ITS-Chlorine-30- 1000
    Chlorine Water Testing Kit - 30 Individual Tests per Bottle
    Free & Total Chlorine test strips are perfect for determining whether or not you have the correct amount of sanitizer present. ITS #480655 UPC # 809762806550 Learn More
    $27.99 Special Price $19.99
  9. TDS-N TDS Meter.  Test your water for total dissolved solids.
    TDS-N TDS Meter. Test your water for total dissolved solids.
    TDS-N TDS Meter. Test your water for total dissolved solids. Learn More
    $39.99 Special Price $27.00
  10. HM DIGITAL- TDS Meter EZ-HMD To Test for total dissolved solids in Water -1000
    TDS Meter EZ - HMD To Test For Total Dissolved Solids In Water
    TDS Meter - Tester To Test For Total Dissolved Solids In Water - Reverse Osmosis Membrane Tester Learn More
    $35.99 Special Price $19.99
  11. Precipitator 2 Repair Kit - 1000
    Precipitator Replacement Rod and Fuse Kit For PR-2.
    PR-2-KIT Precipitator 2 Repair Kit - Includes 4 replacement iron rods, two aluminum rods and two fuses. If you have the old style PR-2 Precipitator with the WaterFiltersOnline.com Logo and the switch in the center order the first rod and fuse kit. If you have the new style PR-2 Precipitator without the WaterFiltersOnline.com Logo and the switch on the side order the second rod and fuse kit. Learn More
    $29.99 Special Price $19.99 As low as $11.99
  12. HM Digital AP-1 AquaPro Water Quality Total Dissolved Solids Tester
    HM Digital AP-1 AquaPro Water Quality Total Dissolved Solids Tester
    HM Digital AP-1 AquaPro Water Quality Total Dissolved Solids Tester, 0-5000 ppm TDS Range, 1 ppm Resolution, +/- 2% Readout. HM Digital introduces its new AquaPro series, a line of handheld TDS/EC meters with a sleek design that's perfect for today's modern kitchen. The AquaPro digital water testers are the next generation for today's tech-savvy and health-conscience consumer. Learn More
    $42.95 Special Price $29.99 As low as $20.00
  13. TDS Meter - Test For Total Dissolved Solids In Water - Reverse Osmosis Membrane Tester - TDS Meter
    TDS Meter - Test For Total Dissolved Solids In Water - Reverse Osmosis Membrane Tester - TDS Meter
    TDS Meter - Tester. The Only Way To Know If Your Reverse Osmosis RO Membrane Is Performing Correctly - Tests for TDS - Total Dissolved Solids. A Must For All RO System Owners. Compare Incoming Feed Water To Treated Water - Replace Membrane If Less Than 80% of TDS Is Being Removed Learn More
    $49.99 Special Price $37.99 As low as $17.99
  14. TDS-3 Handheld Pure Water Testing Meter For Total Dissolved Solids
    TDS-3 Handheld Pure Water Testing Meter For Total Dissolved Solids With Carrying Case
    TDS-3 Handheld Pure Water Testing Meter For Total Dissolved Solids With Carrying Case. HM Digital. Features Ideal for commercial use. Includes a carrying case with belt clip. 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. 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. Built-in digital thermometer Display: large and easy-to-read LCD screen. Factory Calibrated: our meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver. TDS Range: 0 - 9990 ppm (mg/L) Temp. Range: 0 - 80 degrees Celsius Resolution: 1 ppm, 1 degree Celsius (also available in 10 ppm) Accuracy: +/- 2% ATC: Built-in sensor for Automatic Temperature Compensation of 1 to 50 degrees Celsius (33 to 122 degrees Fahrenheit) Power source: 2 x 1.5V button cell batteries (included) Battery life: 1000 hours of usage Dimensions: 15.5 x 3.1 x 2.3cm (6.1 x 1.25 x 1 inches) Weight with case: 76.5g (2.7 oz) Weight without case: 56.7g (2 oz) Learn More
    $59.99 Special Price $39.99 As low as $24.99
  15. TDS Meter Inline Water Tester DM1 - HM Digital Dual Mode Reading
    TDS Meter Inline Water Tester DM1 - HM Digital Dual Mode Reading - Easily Installs Inline - Very Simple To Use
    TDS Water Meter - HM Digital DM1 - Dual Mode - Installs Inline - Check the TDS level with the push of a button. Now you can easily check to make sure the water from your reverse osmosis system is top quality. Measure the tap water coming in vs. the purified water going out of your system at any time. Very easy installation. Highly efficient and accurate due to its advanced microprocessor technology. Auto-Off function conserves battery power. The unit shuts off automatically after 10 minutes of non-use. Dual Range 0-9990 ppm. Always know if your RO membrane is performing correctly! Learn More
    $49.99 Special Price $39.99 As low as $19.99
  16. TDS Water Meter Dual Mode Readings - DM2 HM Digital Professional Grade
    TDS Water Meter Dual Mode Readings - DM2 HM Digital Professional Grade - Easily Installs Inline - Very Simple To Use
    TDS Meter Dual Mode Readings - Professional Grade - Easily Installs Inline - Very Simple To Use. Measure the tap water coming in vs. the purified water going out of your system at any time. Use the meter to determine when the filters need to be changed. Highly efficient and accurate due to its advanced microprocessor technology. Displays TDS levels of the Feed Water and Product Water with in & out electrode probes. Auto-Off function conserves battery power. The unit shuts off automatically after 20 seconds. Dual Range - Measures from 0-999 ppm, with a resolution of 1 ppm. Learn More
    $69.99 Special Price $49.99 As low as $29.99
  17. WATERPROOF EC / TDS / TEMP COMBO METER / PROFESSIONAL TESTER - HM Digital COM-100
    WATERPROOF EC / TDS / TEMP COMBO METER / PROFESSIONAL TESTER - HM Digital COM-100
    FOR THE PROFESSIONAL ! ------ COMBO METER / TESTER FOR EC / TDS / TEMP - WATERPROOF. The only handheld TDS meter / EC meter with full scale digital calibration. A water tester that is perfect for both consumer or commercial use. Ideal for all water quality testing, water purification applications, wastewater regulation, aquaculture, hydroponics, colloidal silver, labs & scientific testing, pools & spas, ecology testing, boilers & cooling towers, water treatment and more. Learn More
    $76.95 Special Price $59.99 As low as $47.99
  18. Hanna ® TDS Calibration Solution Packet # 70032 For Water Testing TDS Meters
    Hanna ® TDS Calibration Solution Packet # 70032 For Water Testing TDS Meters
    Hanna ® TDS Calibration Solution 1382 PPM for calibrating TDS Meters / Testers to use for testing Reverse Osmosis RO Systems. # 70032 Learn More
    $8.99 Special Price $4.99 As low as $2.99
  19. HM Digital PH-80 PH Water Testing Meter
    HM Digital PH-80 PH Water Testing Meter

    The PH-80 is an economically priced, reliable pH meter that is ideal for testing applications such as hydroponics & gardening, pools & spas, aquariums & reef tanks, water ionizers, drinking water and more.

     

    FEATURES

    • Measures pH and Temperature
    • One-touch automatic digital calibration
    • Water resistant
    • Simultaneous temperature display
    • Sleek, lightweight design
    • Large LCD display
    • Automatic Temperature Compensation (ATC)
    • Auto-off function, data-hold function and low-battery indicator
    • Includes storage solution in a sponge embedded in a translucent cap
    • Factory Calibrated.  The PH-80 meter is factory calibration to pH 7.0. The meter can easily and quickly be recalibrated with digital calibration to pH 4.0, 7.0 or 10.0 using the meter's simple one-touch process.
    • Includes a cap, batteries, storage solution and pH 7.0 buffer
    Learn More
    $79.99 Special Price $49.99
  20. HM Digital PH-200 Waterproof Ph Water Testing Meter With Temperature
    HM Digital PH-200 Waterproof Ph Water Testing Meter With Temperature
    Incredibly accurate! A pH tester that is perfect for both consumer or commercial use. Ideal for all pH testing, water purification applications, wastewater regulation, aquaculture, hydroponics, colloidal silver, labs & scientific testing, pools & spas, ecology testing, boilers & cooling towers, water treatment, wine, coffee, agriculture and more. Measures pH and Temperature. Auto-ranging three point calibration with digital fine tuning Includes 4 pH buffer solution in a sponge embedded in a clear cap, so you can see if it's dried up. Waterproof housing. Simultaneous temperature display. Measurement Range: 0-14 pH. Digital Calibration (push button). Auto-off function, data-hold function and low-battery indicator. Display: large and easy-to-read LCD screen includes simultaneous temperature reading. Factory Calibrated: The PH-200 meter is three-point factory calibrated to 4, 7, and 10 pH. The meter can be recalibrated with digital calibration using the push buttons, rather than a screwdriver. Includes a cap, batteries, and lanyard. pH Range: 0 - 14 Temperature Range: 0-80 °C; 32-176 °F Resolution: 0.01 pH; Temperature resolution is 0.1 °C/F Accuracy: +/- .02% Calibration: Digital calibration by push button. Electrode: Replaceable glass sensor and reference tube electrodes Housing: Waterproof (submersible; floats) Power source: 3 x 1.5V button cell batteries (included) Dimensions: 18.5 x 3.4 x 3.4 cm (7.3 x 1.3 x 1.3 inches) Weight without case: 96.4 g (3.4 oz) Learn More
    $119.99 Special Price $84.99 As low as $69.99
  21. HM DIGITAL- Replacement Sensor SP-P2 for PH-200 PH Meter- 1000
    HM Digital SP-P2 Replacement Sensor for PH-200 PH Meter
    HM Digital SP-P2 Replacement Sensor for PH-200 PH Meter Learn More
    $59.99 Special Price $45.99 As low as $39.99
  22. PH Buffer Solution From HM Digital - 12 Pillow Packets
    PH Buffer Solution From HM Digital - 12 Pillow Packets
    HM Digital's pH buffer solution comes in powder form, so it's lightweight, takes up very little space, is inexpensive and has an indefinite shelf life. Variety pack of pH buffer solution. Simple to use. Powder has an indefinite shelf life. Total volume: 1.2 liters. Each powder packet makes 100 ml of solution (when mixed with distilled or deionized water) Contents: 3 packets of 4.0 pH, 6 packets of 7.0 pH, 3 packets of 10.01 pH Extra: Includes one empty 100 ml bottle Accuracy: +/- 0.02 pH at 25 degrees Celsius Preparation directions included with the pack. Learn More
    $19.99 Special Price $13.99 As low as $10.99
  23. Hanna ® pH 7.01 Buffer Solution HI7007M
    Hanna ® pH 7.01 Buffer Solution HI7007M
    Hanna ® pH 7.01 Buffer Solution HI7007M used to calibrate meters. Hanna pH buffers are made of Potassium Dihydrogen Phosphate and Disodium Hydrogen Phosphate and are standardized with a pH meter that is calibrated to NIST primary standard buffer solutions (NIST 186Ie & 186IIe and NIST 158g S.R.M.). 230 ml bottle. Learn More
    $23.99 Special Price $13.99 As low as $11.99
  24. Hanna ® HI70300M Storage Solution For pH & Orp Electrodes For Water Testing
    Hanna ® HI70300M Storage Solution For pH & Orp Electrodes For Water Testing
    Hanna ® HI70300M Storage Solution For pH & Orp Electrodes. 230 ml bottle. Hanna storage solutions are prepared with high grade Potassium Chloride and Potassium Hydrogen Phthalate by titration with NIST 2201 standardized Silver Nitrate and NIST 84j standardized Sodium Hydroxide Solution, respectively. Learn More
    $24.99 Special Price $13.99 As low as $11.99
  25. PH Water Tests - Bottle Of 50 Individual Home Tests - Quick Results
    PH Water Tests - Bottle Of 50 Individual Home Tests - Quick Results
    PH Water Tests - Bottle Of 50 Individual Home Tests - Quick Results. Use with ease in your own home. Find out what level of water quality is coming into your house. Very simple use and very fast results. Learn More
    $22.99 Special Price $15.99 As low as $12.99
  26. 8 in 1 Home Water Test Kit - Very Simple To Use - Quick Results
    8 in 1 Home Water Test Kit - Very Simple To Use - Quick Results
    8 in 1 Home Water Test Kit - Very Simple To Use - Quick Results. Kit includes 2 complete tests for each of the following: Iron, Hardness, Copper, Nitrates, Nitrites, Chlorine, pH and Alkalinity. Learn More
    $22.99 Special Price $14.99 As low as $9.99
  27. Hardness Water Tests - Bottle Of 50 Individual Home Tests - Quick Results
    Hardness Water Tests - Bottle Of 50 Individual Home Tests - Quick Results
    Hardness Water Tests - Bottle Of 50 Individual Home Tests - Quick Results. Use with ease in your own home. Test for hadr water. Find out what level of hardness is coming into your house. Monitor water softener performance. Be sure your settings are correct for premium soft water. Very simple use and very fast results. Learn More
    $22.99 Special Price $15.99 As low as $12.99
  28. Iron Water Test Strips With Test Tablets (20 tests) - Quick Results
    Iron Water Test Strips With Test Tablets (20 tests) - Quick Results
    Iron Water Test Strips With Test Tablets (20 tests) - Quick Results. Use with ease in your own home. Test for iron in your water. Find out what level of water quality is coming into your house. Very simple use and very fast results. Learn More
    $22.99 Special Price $9.99
  29. Chlorine Water Tests - Bottle Of 50 Individual Tests.  Quick Results.
    Chlorine Water Tests - Bottle Of 50 Individual Tests. Quick Results.
    Chlorine Water Tests - Bottle Of 50 Individual Tests. Quick Results. Use with ease in your own home. Find out what level of chlorine is coming into your house. Very simple use and very fast results. Learn More
    $22.99 Special Price $15.99 As low as $12.99
  30. Nitrate & Nitrite Water Tests - Bottle Of 50 Individual Home Tests - Quick Results
    Nitrate & Nitrite Water Tests - Bottle Of 50 Individual Home Tests - Quick Results
    Nitrate & Nitrite Water Tests - Bottle Of 50 Individual Home Tests - Quick Results. Use with ease in your own home. Test for pesticides and more. Find out what level of water quality is coming into your house. Very simple use and very fast results. Learn More
    $22.99 Special Price $15.99 As low as $12.99
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Easy TDS Membrane Performence Calculator
See If It is Time To Replace Your Membrane

Simply enter your Feed Water TDS and RO Water TDS into the boxes above and click "Submit". The percentage of TDS Rejection will be displayed. We normally recommend membrane replacement once you drop below 75%. This may vary in areas with high TDS in the feed water.

See our selection of TDS meters under Water Tests