The inclinometer is an inclination sensor based on fibre Bragg gratings (FBGs). It is designed to measure small variations of angle towards the vertical without the need for temperature compensation by using two FBGs in an innovative push-pull configuration. The sensor total fibre optic design ensures intrinsic immunity to electric sparks and EMI/RFI.
 

Datasheet: 

12.1030ENDS_MuST FBG Mono-Axial Tiltmeter.pdf