TDS, PPM, EC Meters

National Hydro Group is your online source for TDS, PPM, EC Meters. If you cant find the TDS, PPM, EC Meters that meet your needs please give us a ring or send a quick email so we can help you find exactly what you're looking for.
Bluelab ppm Pen-NWGSupply.com
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$94.00
$76.01

Bluelab ppm Pen

BlueLab

The ultimate handy solution for measuring conductivity! The Bluelab ppm Pen is the latest innovation for hand held conductivity meters. It provides...

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$94.00
$76.01
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HM Digital Aquapro TDS Water Tester-NWGSupply.com
Save 30%
$42.95
$30.03

HM Digital Aquapro TDS Water Tester

HM Digital

Measures total dissolved solids (TDS) and temperature. Automatic Temperature Compensation (ATC). Water-resistant housing with digital calibration (...

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$42.95
$30.03
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HM Digital Waterproof Professional pH/EC/TDS/Temp Meter, COM-300-NWGSupply.com
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$159.95
$129.56

HM Digital Waterproof Professional pH/EC/TDS/Temp Meter, COM-300

HM Digital

The HM Digital® Waterproof Professional pH/EC/TDS/Temp Meter COM-300 is ideal for water quality testing, hydroponic growing, water purification app...

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$159.95
$129.56
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Bluelab Conductivity Pen-NWGSupply.com
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$94.00
$76.01

Bluelab Conductivity Pen

BlueLab

Measures conductivity and temperature. Selectable units for conductivity and temperature. Backlit LCD display with low battery warning. Successful ...

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$94.00
$76.01
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HM Digital Handheld TDS-3 Tester-NWGSupply.com
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$36.95
$19.53

HM Digital Handheld TDS-3 Tester

HM Digital

Ideal for commercial use. Includes a carrying case with belt clip. Highly efficient and accurate due to its advanced microprocessor technology. Hol...

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$36.95
$19.53
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Bluelab Truncheon Meter-NWGSupply.com
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$140.00
$121.64

Bluelab Truncheon Meter

BlueLab

$140.00
$121.64
Save 13%
Bluelab ppm Pen-NWGSupply.com
Save 19%
$94.00
$76.01

Bluelab ppm Pen

BlueLab

The Bluelab ppm Pen measures conductivity and temperature and is a great way to ensure plants are receiving the proper amounts of nutrients. This p...

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$94.00
$76.01
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Bluelab Commercial Truncheon Meter-NWGSupply.com
Save 13%
$140.00
$121.64

Bluelab Commercial Truncheon Meter

BlueLab

Big jobs require a big Truncheon! With a conductivity range right up to 6.0EC (60CF or 4200ppm), it will never leave you short. The Commercial Trun...

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$140.00
$121.64
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Sure Test Pro EC / TDS Pen-NWGSupply.com
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$99.95
$84.95

Sure Test Pro EC / TDS Pen

Sure Test

The Sure Test® Pro EC/TDS Pen reads EC, TDS and temperature (F° or C°) with automatic temperature compensation (ATC) for more reliable conductivity...

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$99.95
$84.95
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HM Digital COM-100 Waterproof EC/TDS/Temp Combo Meter-NWGSupply.com
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$76.95
$64.33
Save 16%
HM Digital AquaPro TDS/Temperature Meter-NWGSupply.com
Save 23%
$42.95
$33.04
Save 23%
Milwaukee T75 Waterproof TDS Tester-NWGSupply.com
Save 24%
$89.95
$68.14

Milwaukee T75 Waterproof TDS Tester

Milwaukee Instruments

Waterproof TDS tester with automatic temperature compensation and 1 point manual calibration range: 0.0 to 1999 ppm (mg/L), replaceable MA73075 probe.

$89.95
$68.14
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E.C Dipstick-NWGSupply.com
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$87.95
$62.88

E.C Dipstick

Rose City

Now with the 4 most popular scales: EC, CF, 500:1 ppm, and 700:1 ppm! The E.C. Dipstick dissolved salts pen operates on 3 common inexpensive AA alk...

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$87.95
$62.88
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HM Digital In-Line Dual TDS Monitor-NWGSupply.com
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$41.95
$34.27

HM Digital In-Line Dual TDS Monitor

HM Digital

Displays TDS levels of the feed water and product water with in and out electrode probes. Highly efficient and accurate due to its advanced micropr...

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$41.95
$34.27
Save 18%
HM Digital Water Resistant Ec/TDS Meter w/ Temperature in C/F Hydrotester (Model COM-80)-NWGSupply.com
Save 37%
$47.95
$30.10

HM Digital Water Resistant Ec/TDS Meter w/ Temperature in C/F Hydrotester (Model COM-80)

HM Digital

The COM-80 is an economically priced, reliable EC/TDS meter that is ideal for testing applications such as hydroponics & gardening, pools &...

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$47.95
$30.10
Save 37%
Bluelab Original Truncheon Meter-NWGSupply.com
Save 13%
$140.00
$121.64

Bluelab Original Truncheon Meter

BlueLab

With its super tough, high quality, fully waterproof design, no calibration required, daylight readable blue LED's and no on/off buttons to worry a...

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$140.00
$121.64
Save 13%
Bluelab Commercial Truncheon Meter-NWGSupply.com
Save 13%
$140.00
$121.62

Bluelab Commercial Truncheon Meter

BlueLab

With a conductivity range right up to 6.0 EC (60 CF, 3000 ppm x 500 and 4200 ppm x 700), it will never leave you short. The Bluelab Commercial Trun...

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$140.00
$121.62
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Waterproof EC/TDS Tester-NWGSupply.com
Save 16%
$141.00
$118.62

Waterproof EC/TDS Tester

Hanna

The Waterproof EC/TDS Tester is an easy-to-use, convenient meter. Graphite electrodes ensure accuracy, and are easily replaced with a new cartridge...

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$141.00
$118.62
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Save 6%
$32.00
$30.10

Waterproof EC/TDS/Temp Combo Sensor

HM Digital

This Waterproof EC/TDS/Temp Combo Sensor is a replacement sensor for the Waterproof EC/TDS/Combo Meter (WCM500).

$32.00
$30.10
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HM Digital Waterproof EC/TDS/Temp Combo Meter-NWGSupply.com
Save 16%
$77.00
$64.33

HM Digital Waterproof EC/TDS/Temp Combo Meter

HM Digital

The Waterproof EC/TDS/Temp Combo Meter is ideal for all water quality testing, water purification applications, wastewater regulation, aquaculture,...

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$77.00
$64.33
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Save 23%
$43.00
$33.11

EC/TDS HydroTester

HM Digital

The EC/TDS HydroTester is a reliable EC/TDS meter that is ideal for testing applications such as hydroponics and gardening, pools and spas, aquariu...

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$43.00
$33.11
Save 23%
HM Digital Pocket-Size TDS Meter-NWGSupply.com
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$27.00
$23.03

HM Digital Pocket-Size TDS Meter

HM Digital

Ideal for all water purification applications, waste water regulation, aquaculture, hydroponics and more, the Pocket-Size TDS Meter is highly effec...

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$27.00
$23.03
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Primo TDS Tester-NWGSupply.com
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$53.00
$42.69

Primo TDS Tester

Hanna

Customers who want to ensure the purity of the water produced by an RO water filtration system will enjoy the ease-of-use afforded by the Primo TDS...

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$53.00
$42.69
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HM Digital Handheld TDS Meter with Carrying Case-NWGSupply.com
Save 33%
$37.00
$24.85

HM Digital Handheld TDS Meter with Carrying Case

HM Digital

Ideal for all water purification applications, wastewater regulation, aquaculture, hydroponics and colloidal silver, the Handheld TDS Meter with Ca...

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$37.00
$24.85
Save 33%