Honeywell’s patented General Aerospace Proximity Sensors (GAPS Series) are configurable, non-contact, hermetically sealed devices designed to sense the presence or absence of a target in harsh-duty aircraft applications. The GAPS Series provides on/off output, and can be configured with an optional health monitoring output to the host system. The technology Honeywell uses in the GAPS Series is considered an improvement on traditional ECKO (Eddy Current Killed Oscillator) topology that previously had been the standard in aerospace applications.