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.
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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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 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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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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Oakton Waterproof EC Tester 11+-NWGSupply.com
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$170.99
$141.59

Oakton Waterproof EC Tester 11+

Oakton

Automatically or manually select measuring range Waterproof, dustproof housings float Push-button calibration, HOLD function, and error message...

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$170.99
$141.59
Save 17%
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
Save 13%
Sure Test Pro EC / TDS Pen-NWGSupply.com
Save 15%
$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
Save 15%
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%
Oakton EcoTester CTS Pocket Conductivity, Salinity, and TDS Meter-NWGSupply.com
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$100.00
$81.00

Oakton EcoTester CTS Pocket Conductivity, Salinity, and TDS Meter

Oakton

Oakton® Conductivity, TDS and Salinity in one meter. Expanded 4-digit dual-line display shows conductivity and temperature readings simultaneously....

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$100.00
$81.00
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Milwaukee T75 Waterproof TDS Tester-NWGSupply.com
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$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 Handheld TDS-3 Tester-NWGSupply.com
Save 47%
$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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HM Digital In-Line Dual TDS Monitor-NWGSupply.com
Save 18%
$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
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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%
Oakton Waterproof EcoTestr TDS Low-NWGSupply.com
Save 24%
$87.95
$66.68

Oakton Waterproof EcoTestr TDS Low

Oakton

Oakton Ecotestr TDS Low pocket meter features a large ergonomically designed display so that you can easily view measurements at a glance. The stai...

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$87.95
$66.68
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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
Save 13%
EC Shake Nutrient Meter-NWGSupply.com
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$99.95
$76.14

EC Shake Nutrient Meter

Phresh

This revolutionary EC meter is powered by a magnet instead of a battery! A gentle shaking action generates the energy to power this simple, yet sop...

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$99.95
$76.14
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Waterproof PTTestr 35 TDS-NWGSupply.com
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$173.70
$123.40

Waterproof PTTestr 35 TDS

Oakton

This Waterproof PTTestr 35 TDS from Oakton is a convenient and accurate multi-use instrument. With features like double-junction pH electrodes, aut...

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$173.70
$123.40
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Waterproof PCSTestr 35 TDS-NWGSupply.com
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$181.50
$144.32

Waterproof PCSTestr 35 TDS

Oakton

This Waterproof PCSTestr 35 TDS from Oakton is a convenient and accurate multi-use instrument. With features such as auto shutoff and more, it's a ...

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$181.50
$144.32
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Waterproof EcoTestr TDS Low-NWGSupply.com
Save 24%
$87.00
$66.13

Waterproof EcoTestr TDS Low

Oakton

Oakton’s Waterproof EcoTestr TDS Low is a convenient TDS meter that doesn’t let dirt or moisture keep it from delivering accurate readings. It feat...

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$87.00
$66.13
Save 24%