For proper pitch setup, you can't go wrong with this pitch
gauge, with an indicator showing you the degree of pitch your
helicopter is currently set to.
For proper use, slide onto the blades of a stationary helicopter,
and with the motor unplugged, level the pitch gauge with the flybar,
and the indicator will show the current pitch of the blades.
This gauge will measure pitch from -12 to +12 degrees.
Feature: include ruler; very inexpensive tool.