Product Description
Milwaukee MW306 MAX Waterproof EC/TDS/Salinity/Temp Data Logger: Professional 4-in-1 Conductivity Testing
The Milwaukee MW306 MAX is a professional-grade 4-in-1 conductivity meter that measures electrical conductivity (EC), total dissolved solids (TDS), salinity (NaCl), and temperature with exceptional ±1% accuracy. Featuring IP67 waterproof construction and advanced data logging capabilities, this meter is the professional choice for hydroponics, aquaculture, horticulture, food processing, water treatment, and laboratory applications.
Key Benefits
4-in-1 Professional Testing: Measure EC, TDS, salinity (NaCl), and temperature with one meter and one probe
Lab-Grade Accuracy: ±1% of reading for EC/TDS/NaCl, ±0.5°C (±0.9°F) for temperature
Advanced Data Logging: Store up to 1,000 samples with on-demand, stability, or interval logging modes
USB Connectivity: Easy data download via micro USB for analysis and record-keeping
IP67 Waterproof: Fully submersible, rugged design built for demanding field and lab environments
Extended Range: 0-500 mS/cm EC, 0-400 g/L TDS, 0-400% NaCl salinity
Auto-Ranging: Automatic range selection for EC and TDS measurements
GLP Compliance: Good Laboratory Practice features with date, time, and calibration tracking
Why Choose the MW306 MAX?
The MW306 MAX is preferred by professionals who need precise conductivity and salinity measurements with complete documentation. The easy-to-use logging feature allows data collection without messy notes and transcription errors. From aquaculture and coral reef management to hydroponic growers and food processors, the MW306 MAX delivers fast, accurate readings with comprehensive data management.
What Customers Say
"Amazingly accurate, the best meter I have used so far."
"Very satisfied, very accurate, rugged device that calibrates easily."
"Rarely needs to be calibrated and gives perfect readings every time."
"Logging data is easy-to-use and download."
"Love the GLP function."
"Killer tool, good value."
Advanced Features
Professional Accuracy:
±1% of reading for EC, TDS, and salinity (NaCl)
±0.05 µS/cm or 1 digit for EC (whichever is greater)
±0.03 ppm or 1 digit for TDS (whichever is greater)
±0.5°C (±0.9°F) temperature accuracy
Automatic Temperature Compensation (ATC) from -5 to 100°C
Adjustable TDS factor (0.40 to 0.80, default 0.50)
Adjustable temperature coefficient (0.00 to 6.00%/°C, default 1.90%/°C)
Extended Measurement Ranges:
EC Range: 0.00 µS/cm to 500.0 mS/cm (absolute conductivity)
TDS Range: 0.00 ppm to 400.0 g/L (with 0.80 factor)
Salinity Range: 0.0-400.0% NaCl, 2.00-42.00 PSU, 0.00-80.00 g/L
Temperature Range: -20.0 to 120.0°C (-4.0 to 248.0°F)
Auto-Ranging: Automatic range selection for optimal resolution
Professional Data Logging:
Maximum 1,000 sample storage capacity (max. 100 lots)
On-demand logging: 200 samples
Stability logging: 200 samples (auto-log when reading stabilizes)
Interval logging: 1,000 samples at set time intervals
USB download via micro USB port for PC connectivity
GLP data with date, time, and calibration tracking
Internal clock for timestamp functions
Rugged Design:
IP67 waterproof rating—fully submersible and dustproof
Large dual-level digital LCD display for easy reading
Lightweight and portable (0.58 lbs with battery)
200-hour battery life (3 x AA alkaline batteries included)
Battery Error Prevention System (BEPS)
Selectable auto-off: 5, 10, 30, 60 minutes or disabled
Intuitive alphanumeric LCD messages for operation and alerts
Premium MA815D/1 Conductivity Probe Included
The MW306 MAX comes with Milwaukee's top-selling MA815D/1 amplified 4-ring conductivity probe—a lab-grade electrode designed for professional applications. This premium probe features:
4-Ring Design: Superior accuracy and stability across wide measurement ranges
Low Maintenance: Easy-to-clean design for long-term reliability
Built-in Temperature Sensor: Enables automatic temperature compensation (ATC)
3-Foot Cable: Extra flexibility for field and lab testing
Rugged Construction: Withstands challenging samples and environments
Easy Cleaning: Slide off plastic shield, clean rings with DI water and soft cloth
Technical Specifications
EC Specifications:
Range: 0.00-29.99 µS/cm, 30.0-299.9 µS/cm, 3.0-29.9 µS/cm
Range: 300-2999 µS/cm, 3.00-29.99 mS/cm, 30.0-200.0 mS/cm
Range: Up to 500.0 mS/cm (absolute conductivity)
Resolution: 0.01 µS/cm, 0.1 µS/cm, 1 µS/cm, 0.01 mS/cm, 0.1 mS/cm
Accuracy: ±1% of reading / ±0.05 µS/cm or 1 digit (whichever is greater) @ 25°C/77°F
TDS Specifications:
Range: 0.00-14.99 ppm, 15.0-149.9 ppm, 150-1499 ppm
Range: 1.50-14.99 g/L, 15.0-100.0 g/L, up to 400.0 g/L (absolute TDS with 0.80 factor)
Resolution: 0.01 ppm, 0.1 ppm, 1 ppm, 0.01 g/L, 0.1 g/L
Accuracy: ±1% of reading / ±0.03 ppm or 1 digit (whichever is greater) @ 25°C/77°F
TDS Factor: 0.40 to 0.80 (default 0.50)
Salinity Specifications:
Range: 0.0-400.0% NaCl, 2.00-42.00 PSU, 0.00-80.00 g/L
Resolution: 0.1% NaCl, 0.01 PSU, 0.01 g/L
Accuracy: ±1% of reading @ 25°C/77°F
Calibration: One point with MA9066 salinity calibration solution
Temperature Specifications:
Range: -20.0 to 120.0°C (-4.0 to 248.0°F)
Resolution: 0.1°C / 0.1°F
Accuracy: ±0.5°C (±0.9°F)
Compensation: Automatic -5.0 to 100.0°C (-23.0 to 212.0°F) or manual
Calibration:
EC/TDS: Single cell factor calibration
6 standard solutions: 84 µS/cm, 1413 µS/cm, 5.00 mS/cm, 12.88 mS/cm, 80.0 mS/cm, 111.8 mS/cm
One point offset: 0.00 µS/cm
Temperature coefficient: 0.00 to 6.00%/°C (default 1.90%/°C)
General Specifications:
Probe: MA815D/1 (4-ring conductivity probe with built-in temperature sensor)
Data Logging: 1,000 samples max (on-demand, stability, interval modes)
PC Connectivity: Micro USB port
Battery: 3 x 1.5V AA alkaline (included)
Battery Life: Approx. 200 hours
Auto-Off: Selectable 5, 10, 30, 60 min. or disabled
Environment: 0-50°C / 32-122°F; max RH 95%
Dimensions: 200 x 85 x 50 mm (7.9 x 3.3 x 2.0 inches)
Casing: IP67 waterproof and dustproof
Weight: 0.26 kg / 0.58 lbs (with battery)
Warranty: 2 years (meter)
Applications
Hydroponics and nutrient solution management
Aquaculture and fish farming
Coral reef aquarium maintenance
Horticulture and greenhouse operations
Food and beverage processing
Water treatment and conditioning
Laboratory research and testing
Environmental monitoring
Wastewater analysis
Soil salinity testing
Irrigation water quality
What's Included
MW306 MAX waterproof meter
MA815D/1 amplified 4-ring EC/temperature probe
3 x AA alkaline batteries
Micro USB cable for data download
Instruction manual
Calibration solutions (check package contents)
Care, Use & Cleaning
EC meters typically perform poorly when sediment builds up on the conductivity probe's rings, changing impedance and affecting accuracy. Proper maintenance ensures reliable, accurate results.
Cleaning:
Slide off the plastic shield to access the conductivity rings
Clean rings with DI (distilled) water and a soft cloth
Clean regularly to maintain accuracy, especially after testing dirty or high-TDS samples
Avoid abrasive materials that could scratch the rings
Storage:
Store EC probe dry when not in use
Keep meter and probe in a safe area to avoid damage
Remove batteries if not in use for prolonged periods to prevent corrosion
Store in protective case if available
Calibration:
Easy 1-point calibration with built-in ATC for high accuracy
Calibrate regularly to maintain meter accuracy
Use appropriate calibration solution for your measurement range
GLP function tracks calibration date and time for quality assurance
Why Milwaukee Instruments?
Milwaukee Instruments is trusted worldwide by professional growers, aquaculturists, food processors, and laboratories for rugged, reliable testing equipment. The MW306 MAX combines Milwaukee's legendary build quality with cutting-edge data logging technology and exceptional customer service—backed by a 2-year warranty and decades of proven performance in the most demanding applications.
Professional conductivity testing with advanced data management: Get lab-quality EC, TDS, and salinity measurements with comprehensive logging and USB connectivity, all in a waterproof, field-ready package.
