Surface Deflection Indicator (Robart 407)
SDI Gauge Surface Deflection Indicator by Robart Mfg.(rob407)
The key to a great flying RC Airplane is alignment and setup.
Surface Deflection Indicator
This device measures the amount of up/down or left/right on your model aircraft elevator, ailerons, flaps and rudder.
The indicator features precise measurement of surface deflection inches and is suitable for large and small aircraft.