Calculated Industries 6425-C - Manual (Page 47)

User’s Guide — 45
Q: I’ve taken several measurements for the same thing but the mea-
surements are different. Is something wrong with the
DigiRoller
™ Plus II ?
A: When you are measuring a distance, you need to ensure that
you start and stop your measurement while holding the
DigiRoller
™ Plus II at the same angle (preferably upright or ver-
tical). If you do not, your measurement may be inaccurate.
When you move the unit from an angled to a vertical position
or vice versa, the unit will add or subtract by as much as four
inches, therefore changing the overall measurement. Also,
rolling the unit backwards will subtract measurement units.
Q: My wheel “wobbles” when I roll the unit – is this normal?
A: When the wheel starts to wobble, you should check two things:
1) check that the flat spot inside the wheel hole and the flat
spot on the axle shaft are aligned;
2) check that the hub cover is on finger tight (approximately
1/2 additional turn after the wheel hub cover touches the
wheel surface).
6425-UG-C 4/4/03 12:44 PM Page 47