Crack Width Microscope is a high quality product designed for measuring crack widths, both in concrete and other materials. British made, the high definition microscope is connected to an adjustable light source which provides a well - illuminated image under all working conditions.
The image is focused by turning the knob at the side of the microscope and the eyepiece graticule can be rotated through 360º to align with the direction of the crack under examination. The 4mm range of measurement has a lower scale divided into 0.2mm divisions. These 0.2mm divisions are sub - divided into 0.02mm divisions.
The instrument is a microscope which has a calibrated graticude (scale). When you focus the instrument on the concrete surface, the graticule can be seen through the eyepiece, it looks as if the scale is on the crack which allows the user to accurately measure the width of the crack. Current Codes of practice, state that calculated maximum crack widths should not exceed certain values: e.g. 0.3 mm in BS 8110 : Part 2 for most types of environment. This value of 0.3 mm is 15 divisions on the graticule.
Microscope is very easy to use and comes with simple instructions in a wooden carrying box.