PASCO SPARK Science Learning System Ver. 1.4.0 User's Guide - Manual (Page 69)

6 Image capture
Measuring in a camera image
4. Touch the box at one end of a measurement arrow.
The measurement arrow is deleted.
Calibrating camera image measurements
To calibrate measurements, the image must include an object of known length.
1. Touch the Image Tools button to open the tool palette.
2. In the tool palette, touch the Measurement button.
3. Touch the point on the image at one end of the object of known length.
4. Touch the point on the image at the other end of the object of known length.
5. If necessary, drag the ends of the measurement tool so that it exactly represents the known
length.
6. Touch the Measurement button again.
The Measurement button turns orange, and the measurement toolbar appears.
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