Measuring, detecting, monitoring and controlling devices, namely for measuring the movement of a part, valve, surface, nut, bolt or other fastener or connector; Sensors, detectors and monitoring instruments, namely for detecting the motion of a part, valve, surface, nut, bolt or other fastener or connector; Sensors, namely inductive sensors, eddy current sensors, accelerometers, inertial sensors, capacitive sensors, proximity sensors, rotation sensors, infrared sensors and bolt monitoring sensors; measuring devices, namely devices for measuring movement of a valve, part, surface, nut, bolt or other fastener or connector; torque transducers; Optical sensors; Electro-optical sensors; torque meters; torque measuring apparatus; digital torque gauges; Safety, security, protection and signalling devices, namely devices for warning of movement of a valve, part, surface, nut, bolt or other fastener or connector; Electronic sensors for detecting movement; Monitoring instruments, namely, electronic monitors for monitoring movement of a part, valve, surface, nut, bolt or other fastener or connector; Safety devices for nuts, bolts and other fasteners and connectors, namely instruments which detect loosening of a part, surface, valve, nut, bolt or other fastener or connector; safety devices for rotatable shafts, namely safety markers; indicator devices for a part, valve, surface, nut, bolt or other fastener or connector, namely electronic indicators for indicating when movement has occurred; indicator devices for rotatable devices, namely movement indicators to identify movement of a part, valve, surface, nut, bolt or other fastener or connector