Marine rudder indicator. 1.adopt high-presicion Hall angle sensor, 2.good precision,stable performance; 3.genuine manufactur Marine rudder angl indicator [No frequency interference ] NEW PRODUCT!! Rudder Angle Indicator (no frequency interference) Model No.: FD-7BType: Hall Voltage sensor typeInclude one meter (45C-v),one rudder transmitter(Dz-319), one mounting plate,one connecting linkage; ...