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  Our Catalog   Test, Measure & Inspect   Water Quality & Instrumentation

Water Quality & Instrumentation - 375 - Extreame Savings! Save up to 41%


Extreame Savings! Up to 41% off on Water Quality & Instrumentation at In The National Interest. Top brands include OudysCare, Brewer's Elite, VantaKool, iTavah, Med X, DONECO, Watersafe, HoneForest, Syrtenty, Hach Company, KUNHEWUHUA, U.S. Solid, Hanchen, Oakton, YSI, & Myron L. Hurry! Limited time offers. Offers valid only while supplies last.



20-Pack TENS Unit Electrodes Replacement Pads 2'' Square Shape Massage Electrode Pads with 2.0mm Plug for TENS 3000, EMS Digital Therapy Machine Massager
20-Pack TENS Unit Electrodes Replacement Pads 2" Square Shape Massage Electrode Pads with 2.0mm Plug for TENS 3000, EMS Digital Therapy Machine Massager
In Stock
$12.99

mpn: 43234-2227, ean: 0701988734955,

Note: Add OudysCare Premium-Quality TENS Unit Electrode Pads to your Cart is necessary for your Health, Only Sold by OudysCare NEW 20 pcs 5x5cm Nerve Stimulator with 2mm Plug Electrode Pads Tens Electrodes for Tens Digital Therapy Machine Massage...


Brewer's Elite Hydrometer - for Home Brew Beer, Wine, Mead and Kombucha - Deluxe Triple Scale Set, Hardcase and Cloth - Specific Gravity ABV Tester
Brewer's Elite Hydrometer - for Home Brew Beer, Wine, Mead and Kombucha - Deluxe Triple Scale Set, Hardcase and Cloth - Specific Gravity ABV Tester
In Stock
$29.51
$19.99
You Save: 32%

mpn: COMINHKG086538, ean: 0781176315463,

Do you want take pride in Hombrewing? Then you need the Brewer's Elite Deluxe Triple Scale Hydrometer Set! Here at Brewers Elite, it is our mission to make the world's best Hombrew tools & equipment, so that you can focus on making the world's best b...


Digital PH Meter, VANTAKOOL PH Meter 0.01 Resolution Pocket Size Water Quality Tester with ATC 0-14 pH Measurement Range for Household Drinking Water, Aquarium, Swimming Pools, Hydroponics(Blue)
Digital PH Meter, VANTAKOOL PH Meter 0.01 Resolution Pocket Size Water Quality Tester with ATC 0-14 pH Measurement Range for Household Drinking Water, Aquarium, Swimming Pools, Hydroponics(Blue)
In Stock
$13.99

mpn: PH Meter, ean: 0606682221186,

Digital PH Meter Water Tester This pH meter is affordable and useful for those who need a PH tester for household and laboratory use. It's not only ideal for household or laboratory use. Also suitable for testing pH balance of drinking water, pool, a...


Brix Refractometer for Homebrew Beer Wort, iTavah Dual Scale Automatic Temperature Compensation 0-32% Specific Gravity Hydrometer with ATC
Brix Refractometer for Homebrew Beer Wort, iTavah Dual Scale Automatic Temperature Compensation 0-32% Specific Gravity Hydrometer with ATC
In Stock
$112.27
$66.63
You Save: 41%

mpn: DH031800,

iTavah Dual Scale Brix Refractometer with ATC - the Best Refractometer for Home Brewing, Wine or Beer Making iTavah portable hand held refractometer, with automatic temperature compensation(ATC), offers proper control of your brewing by testing t...


TENS / EMS Unit 20 Snap Tens Unit Electrode Pads Large Premium Tens Electrodes Reusable up to 25 times per electrode Med X Brand - FDA Cleared
TENS / EMS Unit 20 Snap Tens Unit Electrode Pads Large Premium Tens Electrodes Reusable up to 25 times per electrode Med X Brand - FDA Cleared
In Stock
$12.59
$11.79
You Save: 6%

mpn: DINOW-09834, ean: 0646117884982,

EVERY ORDER Comes with 100% Satisfaction No Risk Money Back Guarantee! Beware of fraudulent sellers our guarantee only comes with Med X branded pads 20 Electrode Pads for TENs Machines and EMS Machine Use - Snap on Tens Electrode Pads ( 10 packs of...


DONECO 2'' Square TENS Unit Electrodes, 48-Pack Electro Pads for TENS Therapy - Universally Compatible with Most TENS Machine Models - 48-Piece Value Pack - Self-Adhering, Reusable and Premium Quality
DONECO 2" Square TENS Unit Electrodes, 48-Pack Electro Pads for TENS Therapy - Universally Compatible with Most TENS Machine Models - 48-Piece Value Pack - Self-Adhering, Reusable and Premium Quality
In Stock
$30.99
$24.99
You Save: 19%

mpn: DT-01, ean: 0640265261442,

Get the Most of Your TENS Machine! For anyone suffering from tight muscles or a sore back, a TENS machine delivers a light current that can help ease uncomfortable pain. But when the electro pads lose their stickiness and can't adhere to your skin, ...


Watersafe WS425W Well Water Test Kit
Watersafe WS425W Well Water Test Kit
In Stock
$24.95
$21.20
You Save: 15%

mpn: WS-425W, ean: 0163121151287,

Fast, easy-to-use water test kits detect hazardous contaminants in municipal and private well drinking water. Drinking water test kits indicate the presence of bacteria, pesticides, and lead. Kits also include readings for nitrate (0 to 50 ppm), nitr...


HoneForest Water Quality Tester, Accurate Reliable, TDS Meter, EC Meter & Temperature Meter 3 in 1, 0-9990ppm, Ideal Water Test Meter Drinking Water, Aquariums, etc.
HoneForest Water Quality Tester, Accurate Reliable, TDS Meter, EC Meter & Temperature Meter 3 in 1, 0-9990ppm, Ideal Water Test Meter Drinking Water, Aquariums, etc.
In Stock
$12.97

mpn: HFTDS-M7, ean: 0685642943528,

Super accurate, reliable and easy to use TDS, EC &Temp water tester reader, with backlit and auto-lock function, 3 years warranty and 90 days money back guarantee. This advanced digital ppm meter pen with Advanced Microprocessor Technology, combines ...


VantaKool Digital PH Meter, PH Meter 0.01 PH High Accuracy Water Quality Tester with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium Water PH Tester Design with ATC(Yellow)
VantaKool Digital PH Meter, PH Meter 0.01 PH High Accuracy Water Quality Tester with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium Water PH Tester Design with ATC(Yellow)
In Stock
$13.79

mpn: PH Meter, ean: 0606682197528,

Specifications: Model: 2017 updated Version Measuring Range: 0-14.0 pH Resolution: 0.1 pH Accuracy: ±0.1 pH(20°C ) Use Environment: RH 95%, 0-50℃(32~176℉ ) Battery: 2×1.5V LR button cell Weight: 1.76 OZ Features: ✅High Quality and Dura...


Syrtenty TENS Unit Electrodes Pads 2x2 44 Pcs Replacement Pads Electrode Patches For Electrotherapy
Syrtenty TENS Unit Electrodes Pads 2x2 44 Pcs Replacement Pads Electrode Patches For Electrotherapy
In Stock
$29.99
$24.99
You Save: 17%

mpn: TSYR2020-44, ean: 0640265453915,

Perfect companion for TENS, Massage, or Muscle Stimulation. An Electrical Muscle Stimulator (EMS) is used for the purposes of encouraging local blood circulation, contraction and relaxation of the muscles and treatment of several types of muscle tend...


Hach 5870004 Pocket Colorimeter II, Ozone
Hach 5870004 Pocket Colorimeter II, Ozone
In Stock
$529.75
$504.00
You Save: 5%

mpn: 5870004,

4.3 out of 5 stars with 41 reviews
Hach 5870004 Pocket Colorimeter II, OzoneSingle Parameter go anywhere portable photometer. USEPA approved for drinking water. Factory-Programmed. Waterproof, Lightweight, Rugged. Backlit Display, Data Logging, Recall. ...


Digital LCD Rotary Viscometer Viscosity Tester Meter NDJ-8S
Digital LCD Rotary Viscometer Viscosity Tester Meter NDJ-8S
In Stock
$685.20

mpn: 28033, ean: 6662783193146,

Digital LCD Rotary Viscometer Viscosity Tester Meter NDJ-8S NDJ-8S Digital rotary viscometer is used for measuring the apparent and absolute viscosity of the liquid. The advanced mechanical design, manufacturing process, and microcomputer control m...


Rotary Viscometer Viscosity Meter w/ LCD Display Screen 1-1×10^5mPa·s
Rotary Viscometer Viscosity Meter w/ LCD Display Screen 1-1×10^5mPa·s
In Stock
$549.00

mpn: USS-DVT4, ean: 0888107027638,

The US Solid Rotary Viscometer w/ LCD Screen is a fluidity tester which tests flow and thickness of various liquids. With this tester you can do your testing your product right on your production line and determine whether it is up to the specificati...


Hanchen TDS-100H-M2+S1 Handheld Ultrasonic Flow Meter Flowmeter Clamp on Sensor (DN15-700mm)
Hanchen TDS-100H-M2+S1 Handheld Ultrasonic Flow Meter Flowmeter Clamp on Sensor (DN15-700mm)
In Stock
$759.00

mpn: HQ-4, ean: 7868047167567,

After your order is confirmed, the product will reach you within 7--13 business days.DescriptionUltrasonic Flow Meter/ultrasonic flowmeter/flowmeter  Hand Hold Ultrasonic Flow Meter Nonwetted measurement, small in size Technical Datas  Linearity...


Oakton Instruments WD-35419-10 Series pH 700 Benchtop Meter with Double-Junction Glass pH Electrode, ATC Probe and Stand, 110/220 VAC
Oakton Instruments WD-35419-10 Series pH 700 Benchtop Meter with Double-Junction Glass pH Electrode, ATC Probe and Stand, 110/220 VAC
In Stock
$692.00
$512.19
You Save: 26%

mpn: WD-35419-10,

4.7 out of 5 stars with 49 reviews
Oakton Instruments WD-35419-10 Series pH 700 Benchtop Meter with Double-Junction Glass pH Electrode, ATC Probe and Stand, 110/220 VACCompact footprint is over 40% smaller than other bench top meters. Large display permits easier readout viewing. Data...


YSI 6050020 Pro20 Dissolved Oxygen Meter, waterproof
YSI 6050020 Pro20 Dissolved Oxygen Meter, waterproof
By YSI
In Stock
$589.33
$575.02
You Save: 2%

mpn: 5935204,

The ysi professional Series provides plug-and-play capabilities to give you a meter with as much functionality as needed. Build your own system by ordering the meter, probes), and cables) you need without having to purchase additional meters or unnec...


Oakton pH 700 Benchtop Meter with Probes and Stand
Oakton pH 700 Benchtop Meter with Probes and Stand
In Stock
$622.70
$603.00
You Save: 3%

mpn: AO-35419-10,

4.5 out of 5 stars with 28 reviews
The easy-to-use, microprocessor-based pH 700 Bench top meter measures pH, mV, relative mV, and temperature. The large, dual-display LCD provides excellent visibility-even from a distance. Automatic temperature compensation (ATC) maintains reading acc...


Oakton PC700 PC 700 Benchtop Meter with Electrode Stand
Oakton PC700 PC 700 Benchtop Meter with Electrode Stand
In Stock
$787.25
$740.70
You Save: 6%

mpn: AO-35413-20,

4.1 out of 5 stars with 25 reviews
The PC700 meter offers a new compact design that is over 40 percent smaller than other benchtop meters. The large display is easy to read even at a distance. Dual-display allows you to read both a measured parameter and temperature at a glance. The m...


YSI DO200A Dissolved Oxygen Meter with Temperature Compensation, Includes Probe with 4-Meter Cable and Fitted Case
YSI DO200A Dissolved Oxygen Meter with Temperature Compensation, Includes Probe with 4-Meter Cable and Fitted Case
By YSI
In Stock
$630.00
$598.50
You Save: 5%

mpn: 606072,

4.3 out of 5 stars with 30 reviews
Dissolved oxygen (DO) meters measure the amount of dissolved oxygen present in water. The amount of DO helps to determine, for example, drinking water quality, the health of lakes or streams, and aquatic organism sustainability. A probe, also called ...


Myron L 4PII Conductivity, Resistivity, TDS, Temperature Meter
Myron L 4PII Conductivity, Resistivity, TDS, Temperature Meter
In Stock
$755.00

mpn: 4PII,

Both Ultrameter II models deliver exceptional accuracy of ±1% of reading (not merely full scale). This high level of accuracy is achieved through advanced four-electrode conductivity cell technology, a powerful microprocessor, proprietary circuit de...



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