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Instruction Manual
Instruction Manual

Mi306 Conductivity / TDS / NaCl / Temperature Professional Portable Meter

Mi306 is a waterproof portable logging microprocessorbased Conductivity / TDS / NaCl / Temperature meter. The autoranging feature of the EC and TDS ranges automatically sets the meter to the scale with the highest possible resolution. The Auto Endpoint (HOLD) feature automatically freezes the display when a stable reading is reached.

The measurements are automatically (ATC) or manually (MTC) compensated for temperature. The temperature coefficient value is user selectable. It is possible to disable the temperature compensation and measure the actual conductivity (NoTC). The Battery Error Preventing System (BEPS) switches the meter off when the batteries are too weak to support proper function. The meter can store measurements in memory by logging function for retrieval at a later time upon user request.

Mi306 also allows data transfer to computer through the RS232 port. Double LCD displays, for simultaneous readings of the specific conductivity and temperature.

More accurate readings with the 4-RING MA813D/1 EC / TDS / NaCl and Temperature probe.
Conductivity readings are performed by applying an alternate current to the 4-ring probe which creates a variable voltage depending on the conductivity.
Easy PC Compatibility
RS232 or USB communication interface allows readings to be downloaded to a serial port.
(Autoranging) EC Range 0.00 to 29.99 µS/cm; 30.0 to 299.9 µS/cm; 300 to 2999 µS/cm; 3.00 to 29.99 mS/cm; 30.0 to 200.0 mS/cm; up to 500.0 mS/cm actual EC
(Autoranging) TDS Range 0.00 to 14.99 mg/l; 15.0 to 149.9 mg/l; 150 to 1499 mg/l; 1.50 to 14.99 g/l; 15.0 to 100.0 g/l; up to 400.0 g/l actual TDS (with 0.80 factor)
NaCl Range 0.0 to 400.0 %
Temp Range 0.0 to 60.0°C
EC Resolution 0.01 µS/cm (from 0.00 to 29.99 µS/cm); 0.1 µS/cm (from 30.0 to 299.9 µS/cm); 1 µS/cm (from 300 to 2999 µS/cm); 0.01 mS/cm (from 3.00 to 29.99 mS/cm); 0.1 mS/cm (over 30.0 mS/cm)
TDS Resolution 0.01 mg/L (from 0.00 to 14.99 mg/l); 0.1 mg/l (from 15.0 to 149.9 mg/l); 1 mg/l (from 150 to 1499 mg/l); 0.01 g/l (from 1.50 to 14.99 g/l); 0.1 g/l (over 15.0 g/l)
NaCl Resolution 0.1 %
Temp Resolution 0.1°C
EC Accuracy ±1% of reading (±0.05 µS/cm or 1 digit)
TDS Accuracy ±1% of reading (±0.053 ppm or 1 digit)
NaCl Accuracy ±1% of reading
Temp Accuracy ±0.4°C
EC typical EMC Deviation ±1% of reading
TDS typical EMC Deviation ±1% of reading
NaCl typical EMC Deviation ±1% of reading
Temp typical EMC Deviation ±0.1°C
Logging up to 250 records, LOG on demand
Communication with PC through RS232 port
EC Calibration 1 point with 7 memorized buffers: 84 µS/cm, 1413 µS/cm, 5000 µS/cm, 80000 µS/cm, 111800 µS/cm
NaCl Calibration 1 point with MA9066 buffer (optional)
Temperature Compensation automatic or manual from 0 to 60°C (can be disabled to measure actual conductivity and TDS)
Temperature Coefficient 0.00 to 6.00 %/°C (for EC and TDS only)
Coefficient Default value is 1.90%/°C
TDS Factor 0.40 to 0.80 (default value is 0.50)
reference Temperature: 20 or 25°C
Probe MA814D/1 EC probe with built-in temperature sensor & 1 m cable (included)
Auto-off after 5 minutes of non-use (can be disabled)
Battery Type / Life 1 x 9V (included) / approx. 100 hours of use
Casing IP 67
Environment 0 to 50°C / 32 to 122°F; max RH 100%
Dimensions 200 × 85 × 50 mm
Weight 260 g


MA814D/1 4-ring EC probe with DIN connector and 1 m cable
M10030B 12880 µS/cm calibration solution,
20 mL sachet, 25 pcs.
M10031B 1413 µS/cm calibration solution,
20 mL sachet, 25 pcs.
M100335B 111.8 mS/cm calibration solution,
20 mL sachet, 25 pcs.
MA9060 12880 µS/cm calibration solution,
230 mL bottle
MA9061 1413 µS/cm calibration solution,
230 mL bottle
MA9063 84 µS/cm calibration solution, 230 mL bottle
MA9065 111.8 mS/cm calibration solution,
230 mL bottle
MA9066 MA9066 100% NaCl calibration solution, 230 mL bottle
MA9069 5000 µS/cm solution, 230 mL bottle
MA9351 RS232 connection cable (5 to 9 pin)
with 2 meters cable
Mi5200 Application Software
Mi306 is supplied in a hard carrying case complete with
• MA814D/1 EC/TDS/Nacl/Temp probe with DIN connector and 1 meter cable
• MA9060 12880 µS/cm calibration solution
• Mi5200 Application Software
• MA9351 RS232 connection cable with 2 meters cable
• Instruction manual
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