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MAS-1 Soil Moisture Sensor

5. Calibration

approximated by the following linear model. This will

result in slightly worse accuracy at low VWC, with errors

becoming large above 35% VWC.

VWC= 0.0479 * mA - 0.391

Potting Soil/Peat

The following equation can be used to convert MAS-1 trans-

mitted current into VWC in potting soil and peat potting

mixes. Please note that different potting soil types are quite

variable, so this calibration equation may not result in good

accuracy in your particular mix (although precision should

still be good). We recommend a custom calibration for best

accuracy when using the MAS-1 in potting soils.

(0.29*mA)

VWC = 0.00531 *e

Rock Wool

The MAS-1 was calibrated in Groden Expert™ rockwool at

several electrical conductivities. VWC can be calculated as:

VWC = 0.00446 * mA

- 0.0359 * mA + 0.0741