High-Precision Digital Conductivity Meters (EC Meters) & Salinity Analyzers

As a premier ISO-certified B2B manufacturer of electrochemical instruments, Hangzhou Qiwei Instrument Co., Ltd. produces commercial-grade Conductivity Meters (EC Meters, TDS & Salinity Analyzers) engineered for pure water preparation, boiler feed water monitoring, wastewater treatment, and agricultural testing laboratories.

Equipped with multi-range cell constant support ($K=0.1, 1.0, 10$), microcomputer processing circuits, and Automatic Temperature Compensation (ATC), our EC meters deliver rapid, highly accurate, and stable electrolytic conductivity, TDS, and resistivity readouts.

Get Bulk Wholesale Quote Download EC Meter Specification

Pen-Type Conductivity Meter
Model: DDB-12H, DDB-12L
Measuring range: 0-25ms, 0-1999μs
Resolution: 0.01ms, 1μs
Precision: ±0.02ms + 2% FS, ±2μs + 1% FS
Portable Conductivity Tester
Model: DDB-11A
Measuring Range: (0 ~ 199.9) μs/cm; (200 ~1999)μs/cm; (2.00 ~ 19.99)ms/cm; (20.0 ~ 199.9)ms/cm
Resolution: 0.1/1μs/cm; 0.01/0.1 ms/cm
Accuracy: Electro-meter:...
Handheld Conductivity Meter
Model: DDBJ-350
Measuring Range: (0 ~ 199.9) μs/cm; (200 ~1999)μs/cm; (2.00 ~ 19.99)ms/cm; (20.0 ~ 199.9)ms/cm
Resolution: 0.1/1μs/cm; 0.01/0.1 ms/cm
Accuracy: Electro-meter:...
Benchtop Digital Conductivity Meter
Model: DDS-11A
Measurement Range: 0 ~ 2 × 105 μS/cm
Accuracy: ± 1% F × S
Instrument Stability: 0.50%

Explore Our Conductivity Testing Instrument Series

Versatile EC, TDS, and salinity testing options designed for portable field inspection, precision benchtop analysis, and continuous industrial monitoring.

1. Laboratory Benchtop EC / TDS Meters

High-accuracy benchtop instruments featuring large backlit LCD screens, multi-point calibration, automatic range switching, and USB data transmission for R&D laboratories.

Conductivity Range: 0.000 $\mu S/cm$ to 200.0 $mS/cm$
Direct TDS, Salinity, and Resistivity readouts
GLP compliant memory for up to 1000 data sets

Inquire Benchtop Models →

2. Portable Field Conductivity Testers

Rugged handheld meters packaged in waterproof field carrying cases with platinum electrode probes for rapid on-site salinity, TDS, and EC verification in rivers and aquaculture farms.

IP65 waterproof housing with rechargeable battery
Automatic temperature compensation (ATC)
Quick-connect probe inputs for field use

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3. Online Industrial Conductivity Process Controllers

Continuous 24/7 online conductivity sensors and industrial transmitters designed for automated RO water treatment systems, boiler blowdown, and chemical pipeline monitoring.

4-20mA / RS485 Modbus PLC integration
Relay control output for automated RO flushing/dosing
Corrosion-resistant IP68 industrial immersion body

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Critical Industrial Applications & Engineering Strengths

Why Conductivity (EC) Monitoring is Vital

Electrical conductivity measures a solution's ability to conduct an electrical current, directly reflecting total dissolved ionic concentration. Key applications include:

Pure & Ultrapure Water Production: Monitoring RO system efficiency and deionized water purity
Boiler & Cooling Water Systems: Preventing scale formation and managing blowdown cycles
Wastewater Discharge Compliance: Screening total dissolved solids (TDS) in industrial effluent
Agriculture & Hydroponics: Managing nutrient solution concentration for optimal crop yield

Qiwei Manufacturing & OEM Advantages

Supporting global electrochemical instrument distributors, system integrators, and brand owners:

Flexible Cell Constant Matching: Probes available with $K=0.1$ for pure water and $K=10$ for high-salinity brine
Advanced Temperature Compensation: Selectable linear and non-linear temperature coefficients for precise readings
OEM & ODM Customization: Logo branding, custom housing colors, and localized language software UI
Internal Links: Combine with our pH Meters, Electrochemical Instruments, and Spectrophotometers for complete water analysis.

Frequently Asked Questions (EC Meter Sourcing Guide)

Q1: How do Conductivity (EC), TDS, and Salinity relate to each other?

Conductivity measures total ionic current. Total Dissolved Solids (TDS) is calculated by multiplying EC by a specific conversion factor (typically 0.5 to 0.7 depending on ion composition). Salinity measures the total salt content, especially sodium chloride, in seawater or brackish water. Qiwei meters calculate all three parameters automatically.

Q2: How do I choose the correct electrode cell constant ($K$)?

Use $K=0.1$ for high-purity water ($< 20\,\mu S/cm$), $K=1.0$ for standard drinking water and surface water ($10\,\mu S/cm - 200\,mS/cm$), and $K=10$ for high-salinity industrial wastewater or seawater.

Q3: Do you support OEM custom branding and wholesale distributor pricing?

Yes, as a factory-direct manufacturer, we offer complete OEM/ODM custom branding, customized UI interfaces, private label packaging, and tiered volume discounts for global laboratory suppliers.

Require Factory Direct Pricing or Custom Conductivity Testing Equipment?

Get in touch with Hangzhou Qiwei Instrument today for technical consultation, electrode options, and competitive distributor pricing within 24 hours.

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Hangzhou Qiwei Instrument Co., Ltd. is one of the most reliable manufacturers and suppliers of ec meter in China, featured by quality products and good service. Please rest assured to buy bulk durable ec meter in stock here from our factory. We also accept customized orders.

Benchtop Digital Conductivity Meter, Handheld Conductivity Meter