Frequently Asked Questions
  1. Q
    How can it calibrate itself without a level surface?
    The two-stage calibration process measures the direction of gravity in two different positions. Each has it's own error, but the two errors cancel each other out, giving you a true reading of the direction of gravity.
  2. Q
    Why do I need to calibrate it separately for each axis?
    The calibration process does a good job of finding the error in two directions, but not in all three directions. If you never rotate to a different axis, then you only need two directions calibrated. But when you rotate the level to work on another axis, you'll need that third axis to get calibrated properly.
  3. Q
    How accurate is the Level of Vulcan?
    Carpenter's levels have different accuracies, depending on how much money you're willing to spend. A cheap level will measure one part in 500. A more expensive one will do one part in 2000. Level of Vulcan lets you choose, but it's setting doesn't affect the accuracy of the internal sensor. Instead, it changes the size of the central circle. Of course, some devices will use a better gravity sensor than others, so your's might not work well at a higher accuracy. You'll have to experiment with it to see.
  4. Q
    What do you mean by Axis?
    An axis is a line that something can rotate around, the way a wheel rotates around the axle. A mobile device actually has three gravity sensors, one for each dimension. One measures gravity along the X axis, which goes from left to right. Another measures the Y axis, which goes from top to bottom. The last one measures along the Z axis, which is a vertical line when your phone is resting on a level surface.
  5. Q
    What does "calibrate" mean, anyway?
    To calibrate a measurement tool is to adjust it so that it accurately measures what it's supposed to measure. Many simple measurement tools never need calibration, like rulers and thermometers. Others, like volt meters, need to be calibrated every few weeks to ensure accuracy.
  6. Q
    How can I tell if my level needs calibration?
    Place your level on any firm surface and look at the reading. Then turn it around 180° and put it back in the same spot. If your level is well calibrated, it should give you the same reading as before. This works with anybody's level.
  7. Q
    What is the padlock for?
    The level will switch to different views depending on how you orient it. There's one view for each axis. But if you want to use just one view, you can hit the lock button to lock the current view in place.
  8. Q
    Why blue? Most levels use a bright yellow liquid.
    A physical level uses a fluorescent yellow fluid so you can read it easily even in very dim light. Since a mobile phone gives off its own light, it doesn't need to be yellow. You can adjust the color to any one you want.
  9. Q
    I work on roofs. Can I see the roof pitch in roofer's units.
    Yes. You can show the angles as degrees, or per cents, or inches of rise per foot of run.
  10. Q
    Does it work on a tablet, too?
    Certainly. In fact, it probably works better on a tablet. The longer the reach of the device, the more accurate the reading. That's why a good carpenter's level is very long.