G1.3 Gauge

197,00 w/o VAT per box 5 units

  • Measures the change in cracks with gaps between 2 and 20 cm.
  • Accurate to 1/10th of a mm. 
  • Fixing by gluing and/or by using mechanical means (plugs and screws) delivered in the box.

Made in France

Detailed description of G1.3 gauge

This gauge is recommended for measuring to 1/10th mm structural changes involving several centimeters (maximal amplitude 17 centimeters), or noticeable development of a relatively large gap.


The G1.3 gauge is part of the G1 Saugnac type gauges based on the 3 same concepts :

    1. Measurements are made using a vernier measuring to 1/10th of a mm.
    2. They can be fixed in place using double-sided self-adhesive tabs or using mechanical fixing with screws : two ø 4 mm holes facilitate fixing using plugs and screws on difficult structures where self-adhesion and sticking are not possible.
    3. The gauge is delivered with a foldable plastic angle bar inserted into a slotted hold. This patented system offers two advantages : the possibility to fix the jauge in angle easily, and the absorption of unwanted movement in other axis that could block the gauge. More explanations on fixing principles are available on G1 product page

The G1.3 gauge is composed of a rule graduated from 0 to 20 cm sliding within a vernier plate and includes a table for noting dates and readings.

Technical specifications

  • Reading the crack evolution to 1/10th of a mm using a vernier. It is designed for interior and exterior measurement in a single plane of changes in wide gaps.
  • White, in extruded PVC. Sliding tongue in Lexan.
  • Weather-resistant (for outside or wet building)
  • Size : 260 X 40 mm, total depth: 3 mm,
    • thickness of plate = 0,7 mm
    • thickness of sliding tongue = 0,5 mm
  • Weight 8g
  • Traction force in the order of 55g

Examples of reading

1) Exact dimension

The of the vernier scale corresponds exactly to a millimeter graduation.

The dimension in mm is obtained directly

Reading: 33 mm
It can be seen that in the case of an exact reading the last mark on the right of the vernier scale corresponds to a millimeter graduation.
2)  Reading with decimals

The of the vernier is between two millimeter divisions. The millimeter division to the left of the gives a reading in whole numbers of mm.

Now look for a mark on the vernier coinciding with any mark on the rule. this mark indicates the decimal figure to add to the size in whole mm.

Reading: 42.5 mm
It can be seen in the example, that it is clearly division 5 of the vernier which coincides with division 47 of the rule.

Using the G1.3 gauge

As a variation on the so-called “standard” use of the gauge with a rule of 20 cm as shown on the previous page, we propose:

– replacing the rule by another of 50 cm to assess a more significant variation in width,

– abandoning the standard rule and using a 19 mm wide steel millimeter tape passed through 2 vernier plates the distance between which is specified. The tape is fixed on one side.


Intermediate plates can be positioned so as to avoid any buckling of the tape.


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