Apparatus and instruments for monitoring, measuring and tracking strata movement in mining, tunnelling and industrial operations, namely seismic extensometer detectors and computer hardware; monitoring apparatus and instruments, namely alarm monitoring systems and seismic extensometer detectors; remote monitoring apparatus, namely computer hardware and recorded software for remotely monitoring strata movement in mining, tunneling, and industrial operations; visual monitoring apparatus, namely scale measurements, being measurement markers and apparatus for displaying, monitoring and recording measurements of strata movement and displacement, and video monitors; sensors for monitoring physical movements in strata, namely, extensometer sensors in the nature of electronic sensors for measuring changes in the length of objects in calculating stress-strain measurements and pressure sensors, vibration sensors, pressure sensors, and motion sensors; monitoring control apparatus, namely computer hardware and recorded software for controlling the operation of electronic monitoring systems used to track strata movement in mining, tunneling, and industrial operations; apparatus and instruments for capturing, collecting, storing, processing, communicating and displaying data, namely, computer hardware, scanners, and input devices for computers; Recorded and downloadable computer software for collating, analysing and reporting data; alarms and warning equipment, namely, acoustic alarms, electronic warning bells, and electronic warning lights