Models 765M25 and 765M27 are high-intensity acoustic sensors (microphones) designed for the measurement of gas-borne sound in the frequency range of 100 Hz to 30 KHz in industrial applications requiring operation up to 500°F.

These devices are constructed for use in corrosive environments that are compatible with type 316 stainless steel diaphragms. They feature an all-welded construction combined with a miniature isolated hermetic10-32 connector (Model 765M25) or a 2-pin stainless steel hermetic connector (Model 765M27).