Mid-Continent Instrument's B-5 Probe is the only FAA Approved S.T.C.'d internal carburetor temperature sensing device. Designed for use with all Marvel-Schebler and Bendix Float-Type carburetors, the B-5 is the only probe that installs at the throttle valve - the critical icing point in fuel induction systems. Used with the MD-11 Gauge, pilots can monitor and control carburetor heating to within 1C for maximum safety and engine efficiency. Eliminate carburetor icing Reduce spark plug fouling Extend engine life Increase range and power Gain maximum fuel economy The B-5 probe is THE ONLY FAA PMA certified carburetor ice probe available!