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Reverse Osmosis (RO) Water Test Meters
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Reverse Osmosis Water Quality Testing Meters for testing total dissolved solids


Hanna Instruments
HM Digital Water Quality
SpectraPure Water Quality
Hanna Instruments
Total Chlorine Checker
Aquarium Supply Hanna Instruments Total Chlorine Checker ha_chlor_checkerThe HANNA Checker HC bridges the gap between simple chemical test kits and professional instrumentation. Chemical test kits are not very accurate and only give 5 to 10 points resolution while professional instrumentation can cost hundreds of dollars and can be time consuming to calibrate and maintain. The HANNA Checker HC is accurate and affordable.

Check your chlorine levels and know when to replace your carbon filter before chlorine can ruin your TFC membrane.   more...
$49.99
HM Digital Water Quality
HM Digital Pocket TDS
Aquarium Supply HM Digital Pocket TDS Water Quality Testing Meter sp_hm_pocket_tdsHM Digital Pocket TDS Water Quality Testing Meter is the smallest and lightest TDS meter also comes with a built-in digital thermometer. It is a true pocket size meter, comfortably fitting into a shirt pocket without adding bulk. Model: TDS-4TM-A. Weight: 1.2 ounces. Dimensions: 5.5" x .9" x .55".

Exclusive features:
  • Includes an internal digital thermometer (0-80 deg celsius).
  • Hold Function - Saves measurements for convenient reading and recording.
  • Auto-off function - Turns off meter after 10 minutes of non-use to conserve batteries.
  • Dual Range - Measures from 0 - 9990 ppm (mg/L), with a resolution of 1ppm, 1 deg celsius. From 1000 to 9990 ppm, the resolution is 10 ppm, indicated by a blinking x10 image.
  • Factory Calibrated: our meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver.
  • Ideal for all water purification applications, wastewater regulation, aquaculture, hydroponics, and colloidal silver.
  • Power source: 2 x 1.5V button cell batteries (included)(357A).
  • Battery life: 1000 hours of usage.
  • 3 year mfg warranty.
  more...
$24.99
SpectraPure Water Quality
Professional Handheld TDS
Aquarium Supply SpectraPure COM-100 TDS Water Testing Meter sp_tds_com100SpectraPure COM-100 Handheld Total Dissolved Solids (TDS) water quality testing meter with temperature compensation. Perfect for almost every industry and application.

Exclusive features:
  • The TDS to EC Conductivity conversions are true to the curved scale, as opposed to being a linear factor.
  • The temperature compensation coefficients are also matched to the respective scales (KCl, 442 or NaCl), ensuring greater precision
  • The Meter can be calibrated digitally to any known value, while the other meters can only be calibrated to 1 or 2 values (like 1413)
  • Incredible accuracy
  • Resolution to 0.1us
  • Measures TDS, Electrical Conductivity (EC) and Temperature
  • Waterproof
  • On-screen temperature display in Celsius or Fahrenheit
  • Three non-linear EC-to-TDS conversion factors
  • Three true ATC coefficients
  • Auto-ranging (0-9990 ? S, 0-8560 ppm)
  • Detachable platinum electrodes
  • Low battery indicator
  more...
$69.95
TDS Dual Inline Monitor
Aquarium Supply SpectraPure TDS Dual Inline Monitor sp_tds_monitorSpectraPure TDS Dual Inline Monitor. Measure the tap water coming in vs. the purified water going out of your system at any time. Use the monitor to determine when the filters need to be changed. Install the meter for your customers so they'll always know how their system is performing.

  • Comes equipped with John Guest Quick-Connect T-fittings as shown.
  • Displays TDS levels of the feed water and product water with in & out electrode probes.
  • 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 (From 0 - 999 ppm the resolution is 1 ppm. From 1000 to 9990 ppm, the resolution is 10 ppm, indicated by a blinking 'x10' image.)
  • Factory Calibrated: our meters are calibrated with a 342 ppm NaCl solution. Meters can be re calibrated with a mini-screwdriver.
  • Comes equipped with John Guest Quick-Connect T-fittings as shown.
  • Installs quickly and easily.
  • Range: 0-9990 ppm
  • Accuracy: 2%
  • Cable Length: 24.5" (including sensor)
  • Power source: 2 x 1.5V button cell batteries (included)
  • Battery life: over 1000 hours of continuous use
  • Size: 7.6 x 2 x 4.7 cm (3 x .8 x 1.9 in.)
  • Weight: 79.4 g (2.8 oz.)
$29.95