G1.3 Gauge – For wide cracks and large movements

Technical specifications

Presentation of the G1.3 gauge for cracks with a wide gap

The G1.3 gauge has been designed to measure large cracks. The tool can measure structural variations with an amplitude of up to 17 cm with an accuracy of 0.1 mm.

This gauge is also suitable for cracks with a large initial gap, with a fixing capacity of up to 25 cm between centres in standard use.

It has a wide range of applications in the building industry:

• wide crack in a façade;
• wide crack on a house;
• wide crack on an exterior or interior wall;
• wide crack on rock, cliff or stone, etc.

Thanks to its design, the G1.3 gauge for large cracks can be fixed in any type of environment.

Summary of the strengths of the G1.3 gauge for large cracks

Measurement accuracy

The large crack gauge uses a vernier scale accurate to 0.1 mm for fine, detailed measurements.

Mounting options

The product offers two mounting options:

• Double-sided self-adhesives for simple installation. Bonding can be reinforced with two-component adhesive if required.
• Mechanical fixing using the impact anchors supplied with the gauge.

This flexibility makes it easier to adapt to the specific characteristics of a substrate, for example to monitor a large crack in a stone façade, or a large crack in the interior walls of a house.

Patented installation system

The gauge is fitted with a folding bar inserted into an oblong hole on the pull tab. This unique system provides:

• easy installation, even in corners.
• absorption of parasitic movements that could affect the gauge’s accuracy.

Gauge structure

The G1.3 gauge consists of a scale graduated from 0 to 20 cm, sliding on a vernier plate. As an option on request, a 50 cm ruler can be supplied to replace the 20 cm ruler supplied by default.

Measurement tracking

A built-in table allows you to note the dates and readings of measurements directly on the gauge. In addition, each gauge is uniquely identified with a QR code and an identifier. This identification enables measurements to be collected and monitored directly in the Saugnac application supplied free of charge.

How do you read the evolution of a crack with the G1.3 gauge?

1) Exact dimension

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

The dimension in mm is obtained directly.

Reading: 33 mm

Note that in the case of an exact dimension, the last division on the right of the vernier scale corresponds to a millimetre graduation.

2) Reading with a decimal

The of the vernier is between two millimetre divisions. The millimetre division to the left of the gives the dimension as a whole number 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 dimension in whole mm.

Reading: 42.5 mm

Note that in the example above, it is clearly division 5 of the vernier which coincides with division 47 of the rule.

How do you track a large crack with an amplitude greater than 20 cm?

The ‘standard’ use of the large crack gauge is with a 20 cm ruler as shown. However, for larger wall cracks, we offer two solutions.

A 50 cm ruler

The first solution is to replace the 20 cm ruler with a 50 cm ruler to measure a greater variation in amplitude. Contact us to order this made-to-measure solution.

Variant without ruler

The other solution for very wide cracks is to abandon the standard ruler and use 2 G1.3 gauge bodies through which a metal metre rule passes. The metal rule is fixed on one side and slides into the 2 gauge bodies, allowing the reading to be taken.

Download the Saugnac.app application to track your measurements

The Saugnac web application, which is completely free with no restrictions, is available on PC or smartphone from https://saugnac.app. It allows you to:

• identify each G1.3 gauge and its measurements with its unique QR code
• save measurements in your space
• retrieve temperature and humidity levels using geolocation
• calculate measurements with expansion as a function of temperature
• work with several people on the same gauge
• manage alert thresholds
• classify gauges by location and locate them on a map
• download data in Excel format
• automatically display graphs
• share data with others without an account
• access the application from your PC or smartphone
• add measurements offline without a connection

Find out more about how the application works.