Know a How Crack Measuring Device Works

Cracks are likely to occur on concrete structures over time, and they could indicate underlying damage that must be addressed as soon as possible. For this reason, civil engineers rely on crack measuring devices to determine the size and the depth of cracks. There are many different crack measuring devices that are used for different applications. Here are some of them:

Digital Position Strain Gauge Deformation Meter:

This device is one of the most precise options for crack measuring equipment. It comes with a digital dial gauge, which is attached to a bar. A conical point is fixed and mounted at one end of that bar, and a moving conical point at the other end. There is a setting out bar to position pre-drilled stainless steel discs, which are then attached to a structure with an adhesive. The conical points are inserted into holes in the discs when a reading must be made. This way, any strain changes in the structure are translated into a change on the dial gauge's reading.

Measuring Magnifier:

Concrete structures typically have maximum crack width criteria that are between 0.2mm and 0.3mm. This range can easily be measured with a cost-effective magnifier. A good magnifier should come with 10x magnification, a 20mm x 0.1mm measuring range, a 32mm field of view, and a special design that lets you read on dark and light objects. Some magnifiers are self-illuminating, so you can use them in poorly lit areas.

Field Microscope:

This is a small, portable, and lightweight microscope that can perform the tasks of measuring magnifiers and heavy high-end microscopes. Its magnification is 50 times greater than a standard microscope, making it useful when you need an accurate measurement of the width of small cracks to a precision of 0.02mm. Its calibrated focusing ring allows you to measure the depth of cracks, too.

Crack Metres:


A crack width metre is like a ruler designed to help you compare crack sizes and get an approximate crack size when performing visual surveys. Another type of crack metre is the vibrating wire, which measures the movement across joints and surface cracks in concrete, soil, structures, and rock. It has a sensor on the outer body tube, and an inner sliding rod, which is linked via a spring to a vibrating wire sensor.

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