Annual closure from 27 July to 16 August inclusive.
All orders placed after 26 July 2pm will be dispatched on 17 August.
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G1+ Gauge

146,20 w/o VAT per box 10 units

The G1+ gauge, like the other G1 family gauges, is suitable for monitoring parallel lip cracks progressing along a single axis.

Easy “digital” reading accurate to 1/20th of a mm.

Delivered with a box of 10 gauges, 1 pen and detailed notice.

Table of contents

Technical characteristics
Digital reading of the G1+ gauge
Crack in angle
Gauge protection
Related products

Technical characteristics

  • Reading the crack evolution to 1/20th of a mm using digital reading (or 1/10th of mm using the vernier)
  • White, in extruded PVC. Sliding tongue in Lexan.
  • Foldable plastic angle bar inserted into a slotted hold (patented system)

  • Weather-resistant (for outside or wet building)
  • Size : 140 X 40 mm, total depth: 3 mm,
    • thickness of plate = 0,7 mm
    • thickness of sliding tongue = 0,5 mm
  • Weight 5g
  • Traction force in the order of 25g
  • Coefficient of linear expansion = 7.10-5

Digital reading of the G1+ gauge

The major innovation provided by the G1+ gauge resides in its “digital” readout of tenths of mm: indeed, each 1/10 mm movement of the pull tab causes the concomitant obstruction of a row of 6 white lights placed on this same tab. Each row is assigned to a digit (0 to 9) corresponding to the tenths of mm.

 G1+ gauge reading at D day

The mark on the vernier is located between 34 and 35

a) Reading the mm

The number of mm corresponds to the graduation to the left of the mark on the vernier:  34 in the example shown

b) Reading the decimal

Identify the obstructed row(s).
In this example, rows 1 and 2 are obstructed, meaning that the mark on the vernier is mid-way between the first and second tenth.

The reading is thus neither 34.10 mm, nor 34.20 mm but 34.15 mm

Reading of the same G1+ gauge at D+90 days

The mark on the vernier is located between 34 and 35

a) Reading the mm

The number of mm corresponds to the graduation to the left of the  mark on the vernier: 34 in the example shown

b)  Reading the decimal

Identify the obstructed row(s) (black rows).
In this example, only row 7 is black, meaning that the mark on the vernier is positioned exactly on the seventh tenth.

The reading is thus 34.70 mm.

By subtracting the first from the second reading, we can infer that the crack has grown by 0.55 mm in a little more than 3 months.

The vernier, located on the top of the pull tab, will confirm these results if necessary (for instructions on reading the vernier, see the G1 gauge product sheet), though it will be necessary to use a thread counter to read the result of 34.15.

Besides its 1/20 mm precision, combined with its ease and comfort of reading, the G1+ gauge also means:

  • the ability to measure movements with an amplitude of up to 30mm
  • no need to zero the instrument upon fixing: it is not necessary to align the  on the vernier with a measurement scale graduation, an operation frequently difficult to perform with any degree of precision. Simply fix the gauge and read the result displayed
  • a sufficiently flexible material to adapt to and follow the movement of irregular, convex or concave surfaces

Fixing the gauge

By gluing: the gauge can be fixed easily and fastly using double-sides self-adhesive tabs. It is possible to strengthen the sticking using epoxy glue with rapid hardening in twin syringe.

By mechanical fixation: G1 family gauges are supplied ready drilled with two Ø4 mm holes. These holes facilitate fixing by mechanical means using plugs and screws on difficult structures where self-adhesion and sticking are not possible.

We recommend gluing the gauges to the structure wherever the condition of its surface does not allow the use of self-adhesive tabs.
If gluing is also impossible, we advise fixing with plugs and screws. An impact anchors kit ready to use is available for order.

Result of fixing with anchors and screws:

Measuring the variation in a crack in a vertical or horizontal internal angle

It is possible to fix the gauge in angle : G1 family gauges are supplied with a foldable plastic angle bar.

Gauge protection

We recommend that gauges used in public places -schools, shops, streets – should be protected.
The protective cover can also be fixed with plugs and screws. Two types of protection are available: standard protection et high protection anti-UV.


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