Making a SOAR TV Ruler!
How to measure critters you see on TV with Scope-On-A-Rope

1.  Tape a transparency sheet to the TV screen.

2.  Scope a ruler (in millimeters) with the 30X lens.
  ** If you are using the 200X lens, you will need a tiny ruler.   A stage micrometer (used for regular microscopes) is perfect.  Units will be in 0.1mm divisions.

3.  Record image by pressing the RECORD button.  Play the recorded image back by pressing the PLAY button.

4.  Use a marker to trace the millimeter divisions onto the transparency.

5.  On your transparency, write the unit size (1 mm for the 30X, or 0.1 mm for the 200X), the lens magnification (e.g. 30X or 200X), and the diagonal measurement of your TV screen (e.g., 13", 19", or 25").
   ** For your measurements to be correct, you must always use your micro ruler with the indicated lens magnification and TV diagonal size.

6.  Scope an object.  Line up the transparency on the image, and use your new TV ruler to measure your object.
  ** You can make a grid on another tranparency for calculating area!   Remember to record the three important pieces of information on your micro grid: unit size, lens magnification, and diagonal measurement of your TV screen!