Cracks, take the right measures
Table of contents
The G4 gauge is intended for measuring variations in the width of cracks and damaged joints in inaccessible parts of structures: cathedral vaulting, tower block parapets, towers, bridges, silos, distant beams etc.
Wall below guttering of the church of St Martin de Lure (25). With the G4 gauge the changes in the joints in the stonework can be assessed from the ground.
Reading the G4 gauge directly is possible from up to 50 metres away, (with binoculars or a surveying instrument)
We recommend installing a protective plastic casing if the gauge is exposed to the weather.
The mismatch between surface A and surface B is of a few millimetres.
Device for fixing the arm, supplied.
On any kind of structure, as planes A and B are mismatched to a significant extent this may produce 3 dimensional changes. Double ball joint device for fixing the arm.