RockWatch is a range of high definition sensors for measuring displacement to micron accuracy. The displacement sensor, battery, logging capability and wireless communications module are all contained within a small (200 mm x 30 mm diameter) sealed housing. Housings are available for underground applications (Closure Loggers) as well as surface (Crack Loggers) and borehole applications (Extensometers).

Closure Loggers are used in mining excavations and tunnels up to heights of 6.5 m to quantify closure profiles and to identify the onset on instability through highly precise monitoring

Crack loggers:

Range: 100 mm
Resolution: 0.025 mm
Sampling rate: 1 minute
On-board memory: Yes
Battery life: Min 18 months
Disturbance indicator: Yes
Data extraction: Data Grabber (up to 70 m) or GeoLink wireless network


The range of extensometers which is available worldwide is bewildering. Groundwork has acquired a deep understanding of the many types of extensometer which are available to enable us to recommend the most appropriate instrument for your application. Please contact us with details of your project and we will gladly advise you on which type of extensometer to use.

Other Instrumentation

Groundwork specialises in designing instrumentation and monitoring systems to solve bespoke stability problems in the field. Although we have supplier preferences, such as Solexperts, due to the proven performance of their products in our projects, we do not represent and specific suppliers but source from the most appropriate supplier worldwide for the application. Some examples of the instrumentation that we supply to clients on a regular basis are:

  • Closure Robots (telltales for early warning of rock falls)
  • Borehole cameras for depth ranges from 10 m to 600 m
  • Displacement measurement
  • Rock bolt and cable anchor load measurement
  • Pull testing equipment
  • Stress measurement and monitoring cells
  • Piezometers
  • Borehole extensometers for all applications
  • Data logging, telemetry and manual reading options for all types of instrumentation
  • High precision borehole probes