Photos operating the Pocket Sensor

Best way to hold the sensorFor the best data, hold the sensor with your fingers only on the side of the sensor. If your fingers are wrapped around the bottom of the sensor the readings will be affected. These photos show a good operating form.

Incorrect use of the sensorThese photos show how fingers can cover or block the LED light source and lens resulting in erroneous data.

Be careful to insure fingers do not wrap around the bottom of the sensor. This will affect NDVI values.

How can fingers affect measurements?

These photos are of the same area. In the photo on the left, fingers are wrapped around the bottom of the sensor affecting the measurement. In this photo, the LEDs and lens were not covered; however, finger placement was close enought to affect measurements. The photo on the right shows the correct NDVI reading using better measurment practices.

To calibrate the sensorLook for areas that are uniform. The areas do not need to be big, ½ to 1 meter in lenght is sufficient as long as the area is uniform. Mark the area to insure that all measurments with the GreenSeeker and Pocket Sensor are taken over the same spot.