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This model is for observation over cracks, located in corners. Transparent plate of monitor is bent under angle 90 that allows making fastening in angle conjunctions of constructions. If the angle in site of crack monitor location is slightly (+- 10) different from right angle, it is possible to use epoxy clay under mounting site of monitor for compensation of deviation. Crack monitor zi-2u has double-axis scale with calibration 1 mm for visual observation and two metallic reference points for highly-precise monitoring with use of electronic caliper gauge.