Description
Model: EDJ-40C2
The EDJ-40C2 is a biaxial mechanical crack meter designed to measure surface crack displacement and shear movement along two perpendicular axes (X and Y). It provides a direct visual indication of crack width and lateral shear with a resolution of 0.5 mm, making it suitable for reliable long-term structural movement monitoring.
The instrument features a graduated scale plate (±25 mm in the X-axis and ±10 mm in the Y-axis) and a transparent acrylic plate with a precision hairline cursor mark. When mounted across a crack, relative movement between the plates reveals both opening/closing and shear displacement.
Installation is quick and straightforward: the unit is mounted using expandable anchors fixed into 5 mm diameter holes drilled to 30 mm depth, ensuring accurate alignment and durable attachment to the structure surface.
This compact and maintenance-free instrument is ideal for bridges, retaining walls, buildings, tunnels, and concrete dams, where both vertical and horizontal crack movement must be tracked simultaneously.
Specifications
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Instrument type: Crack Meter
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Sensor type: Mechanical, biaxial
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Configuration: Graduated scale with transparent acrylic reading plate for X-Y axis monitoring
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Application: Measurement of surface crack width and shear movement on structural surfaces in X-Y planes
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Measured parameters: Crack displacement, two-axis shear movement
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Measuring range: ±25 mm (X-axis), ±10 mm (Y-axis) — equivalent to 50 mm / 100 mm total range options
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Testing & calibration: Not applicable (manual mechanical reading)
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Key features:
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Measures crack width and shear displacement in two directions
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Readable to 0.5 mm resolution without instruments
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Simple and robust design for long-term field use
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Easy surface installation using 5 mm expansion anchors
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Maintenance-free and suitable for both indoor and outdoor monitoring
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