Substrate Calibration

Published 06-10-2026

Your Sigrow soil sensor comes with a default calibration. If you want the readings to match your own substrate and your own handheld meter, we can make a calibration profile for you.

What you need

• Your Sigrow sensor, left in its normal place in the crop
• Your handheld substrate meter (water content and EC)

What to do

1. Leave the sensor where it is. Do not move it during the test
2. Take 10 to 15 measurements with your handheld meter, right next to the sensor and at the same depth: about 5 when the substrate is dry (just before the first irrigation), about 5 in between, and about 5 when it is wet (shortly after irrigation).
3. Each time, write down three things from your handheld meter:
1. The time
2. the water content
3. the EC (with units)

You can use the table below

Your measurements

Sensor ID:

Substrate:

Copy to sensor IDs:

Good to know

• You do not need to write down the Sigrow readings. The sensor logs them itself and we match them to your times.
• One sensor is enough. Tell us which other sensors are in the same substrate and we copy the profile to them.
• One or two days of normal irrigation is usually enough to cover dry to wet.
• The profile makes your Sigrow sensor agree with your handheld meter, so use a meter you trust.

Download quick guide