H O W   T O   M E A S U R E
Wall to Wall

Place your Roto-Sure on the ground, with the back of the wheel up against the wall. Proceed to move in a straight line the next wall. Stop the wheel up against the wall, record the reading on the counter. The reading must now be added to the diameter of the wheel. The Roto-Sure 1000 has a wheel diameter of 318mm as indicated on the side of the tyre. The Roto-Sure 500 wheel diameter is 159mm as indicated on the tyre.
 
Wall to Point

Place your Roto-Sure on the ground, with the back of wheel up against the wall. Proceed to the end point. Stop with the lowest point of the wheel over the mark. Record the reading on the counter, then add it to the radius of the wheel. The Roto-Sure Classique and 1000, have a radius on 159mm. The Roto-Sure 500 has a radius of 80mm.
 
Point to Point

Place your Roto-Sure on the starting point of the measurement with the lowest point of the wheel on the mark. Proceed to the next mark at the end of the measurement. Record the reading on the counter. This is the final measurement between two points.

Measuring Do's and Don'ts

  1. Pick the surface that you will measure on.
     
  2. Use a hard smooth surface if possible (the harder and smoother the surface, the more accurate the measurement).
  3. Always walk in as straight a line as possible as the wheel will measure all the curves and bumps.
     
  4. Grass (lawn), thick carpets and soft sand will never give an accurate measurement as these surfaces tend to retard the rotation of the wheel and your measurement is likely to be short.
     
  5. In the event of grass it has been found that depending on the position of the sun at the time of measurement the reading will change, as the nap of the grass is affected by the position of the sun. The nap of the grass will affect the measurement.
    The same occurs on a thick pile carpet. The direction of the pile has an influence over the measurement depending on the direction of the measurement against the pile of the carpet of nap of the grass.
    Please note this is noticeable over distances of more than 20 metres.
     
  6. With normal use the measuring wheel always measures more than the distance required. eg: the surface is seldom flat and the path walked is seldom straight.