MW302 Portable EC Meter with Automatic Compensation

The EC MW302 portable meter is suitable for field measurement and ideal for applications related to agriculture and education.

 

The MW302 is a portable high-range conductivity (EC) meter with automatic temperature compensation. This instrument has been designed to meet the needs of growers who require reliable equipment for the harsh environments commonly found in agricultural and hydroponic applications. It is also an excellent meter for food industry applications, laboratory use, and water treatment systems.

EC measurement provides a practical method to optimize the use of chemical products and reduce operational costs. In agricultural applications, soil conductivity is checked before fertilizer application to determine field requirements, and after fertilizing to assess its effectiveness. In hydroponics, EC measurement is ideal for determining the fertilizer concentration in a solution. Once the value is known, the grower can adjust the nutrient formula for optimal plant development.

The MW302 has a range of 0.0 to 10.0 mS/cm with a resolution of 0.1 mS/cm. This EC meter is supplied complete with a conductivity probe with a 1 m (3.3′) cable and a calibration solution.

 

Advantages and Benefits

• Accuracy adapted to real working conditions: range of 0.0 to 10.0 mS/cm with 0.1 mS/cm resolution.

• Automatic Temperature Compensation (ATC): ensures reliable measurements even when temperature fluctuates.

• Portable and ready to use: includes battery (~300 hours of continuous use), lightweight design, perfect for fieldwork.

• Reduced operational costs: EC measurement helps optimize fertilizer/nutrient use and water system maintenance, reducing waste and unnecessary costs.

• Wide application versatility: ideal for agriculture, aquaculture, water treatment, and educational environments.

 

DESIGN FEATURES

• Range of 0.0 to 10.0 mS/cm

• Fast and easy-to-read results with a large digital LCD display

• Supplied with a conductivity probe attached to a 3-foot cable

• Accuracy of ±2% FS at 25 °C

• Lightweight and portable

• 300 hours of battery life under continuous use (battery included)

• SE520 conductivity probe

• MI0031B startup calibration solution, 1413 µS/cm

 

SPECIFICATIONS

• Range: 0.0 to 10.0 mS/cm

• Resolution: 0.1 mS/cm

• Accuracy: ±2% full scale at 25 °C

• Temperature compensation: Automatic, from 5 to 50 °C / 41 to 122 °F

• Conductivity probe: SE520 (included)

• Initial calibration solution: MI0031B, 1413 µS/cm (included)

• Environment: 0 to 50 °C / 32 to 122 °F; max 95% RH

• Battery type: 1 × 9 V alkaline (included)

• Battery life: approx. 300 hours of continuous use

• Meter dimensions: 5.6 × 3.1 × 1.25 inches (143 × 80 × 32 mm)

• Meter weight: 0.5 lb (0.23 kg)

• Package dimensions: 8.35 × 5.71 × 2.74 inches (212 × 145 × 67 mm)

• Package weight: 0.97 lb (0.44 kg)

 

Usage Recommendations

• Before first use, calibrate the meter with the included 1413 µS/cm solution to ensure accuracy.

• Rinse the probe with clean water after each measurement to prevent cross-contamination and extend its lifespan.

• Store the instrument in a dry place, away from excessive heat or humidity.

• If used outdoors or in industrial environments (such as solar installations), ensure the temperature is within the specified range (5–50 °C) so ATC works effectively.

• Recalibrate periodically (for example, after several measurements or whenever readings appear unstable) and replace the battery if the display dims or values take longer to stabilize.

• Always keep an extra calibration solution available, since readings may drift if the probe becomes contaminated or has been heavily used.

 

Additional Useful Information

• This device is especially suitable for agricultural and growing environments and can also be used in the solar industry for monitoring water quality in thermal exchangers or cleaning systems.

• Its “high-range” measurement capability makes it more versatile than meters limited to low-concentration readings.

• Although designed for EC (electrical conductivity), it can also be used as an indirect indicator of TDS (total dissolved solids) when combined with proper conversion tables—useful for water-based cleaning or maintenance systems.

• Keep in mind that, even though portable, it is not designed for full immersion or highly corrosive liquids. The SE520 probe is durable but still requires proper care.

• Check compatibility with your maintenance or engineering systems—additional calibration solutions or replacement probes for the MW302 may be useful.

 

Frequently Asked Questions (FAQ)

1. What is the difference between EC and TDS measurement?EC measures how easily electrical current flows through water, directly correlating to the amount of dissolved ions. TDS is an estimated value calculated from EC using a conversion factor. This device measures EC, which is more direct and reliable for controlling salts or nutrient concentrations.

2. Can I use this meter with hot or very cold water?Yes, as long as the temperature is within the automatic compensation range (approximately 5 °C to 50 °C). Outside this range, accuracy may decrease.

3. How often do I need to calibrate the meter?At least before the first use, and periodically depending on how frequently you use it. If used daily or with nutrient-rich solutions, calibration before each session is recommended.

4. How long does the probe last?The included SE520 probe is high quality, but like any measuring electrode, it will wear over time. With proper cleaning, calibration, and storage, it will provide reliable measurements. Slow or unstable readings may indicate it needs cleaning or replacement.

5. Can this device measure water used in solar panel systems or glass cleaning?Yes. It can measure the conductivity of water to determine mineral content or contamination, helping optimize cleaning or maintenance processes in solar installations. Just make sure the measurement range (up to 10 mS/cm) is suitable for your specific application.

 

 

 

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