Cracks, take the right measures
121,20€ w/o VAT per box 10 units
Made in France
Table of content
In order to most effectively measure the evolution of the crack, the gauge is usually fixed at the widest point of the crack or in the middle of the crack. The G1 gauge is made of a material that is flexible enough to accommodate and follow the movement of irregular, convex or concave surfaces.
There are two possible methods of fixing:
Result of fixing with anchors and screws:
Ideally, position the vernier triangle between 10 and 11 with the two speckled bands appearing on the right and left. The objective is to centre the pull tab. Do not try to position the vernier triangle on the 0. This is useless and very difficult to achieve. Indeed the principle consists in measuring the difference between 2 measurements: it does not matter the value of the first measurement, it is it which will constitute the 0 point.
Position the pin of the folding bar in the middle of the slotted hold to absorb any movement.
The G1 family of gauges is supplied with a folding bar that allows for corner mounting.
We recommend that gauges used in public places (schools, shops, streets) should be protected.
The upper section is graduated in mm from 0 to 30: this is the measurement scale.
The lower section moves: this is the 1/10th mm vernier (10 divisions of the vernier correspond to 9 mm on the measurement scale).
Reading a measurement with a decimal
a) Reading the millimeters:
The pointer of the vernier is between two graduations of the measurement scale. Example: between 13 and 14. The number of mm corresponds to the graduation to the left of the pointer of the vernier: in this case that is 13.
b) Reading the decimal:
Find the line on the vernier which is exactly aligned to a line on the measurement scale. In this example with gauge N°3, graduation 8 on the vernier is in line with graduation 21 on the measurement scale. The decimal reading is thus 8/10th of a mm.
The overall reading is therefore 13,8 mm.
Even simpler to read and more accurate: G1+ gauge with “digital” readout.
In order to facilitate the monitoring of the evolution of the cracks, you can download the Excel file for monitoring the G1 measurements
This Excel file is very easy to use: you just have to duplicate a sheet for each site or construction site observed with the possibility to follow up to 10 gauges.
Note that the impact of the expansion coefficient on the G1 gauge measurement is very small (about 9 micrometers every 1°C).
Here is an example of the type of monitoring obtained with the file:
For inside and outside : weather-resistant. Accurate to 1/20th of a mm. With easy ‘digital’ readout.
For interior use only, particularly in dry rooms. Accurate to 1/10th of a mm.
Transparent for interior and exterior quality structures. Accurate to 1/10th of a mm.
Protection with anti-UV filter for G1 gauges fixed outside (delivered with impact anchors)
Protection for G1 gauges fixed in the public places (delivered with impact anchors).
Glue rapid hardening in twin syringe
Kit for mechanical fixing to the structure wherever the condition of its surface does not allow the use of self-adhesive tabs (1 drill + 1 screwdriver + 30 impact anchors)
Impact anchors pack for mechanical fixing to the structure wherever the condition of its surface does not allow the use of self-adhesive tabs (pack of 50 units)
For measuring the variation in a crack in a vertical or horizontal internal angle (with self-adhesive tabs and 1 impact anchor).