Description
Model: EDJ-41M
The EDJ-41M Crack Meter is a mechanical crack monitoring system designed for precise surface displacement measurement across cracks, joints, or fissures in concrete, masonry, or rock structures. It provides a durable, low-maintenance, and high-accuracy solution for long-term structural health monitoring in civil and geotechnical applications.
The system comprises two precision-machined stainless steel datum blocks, each featuring a circumferential groove used as a reference for measurement. The datum blocks are installed on opposite sides of the crack or joint, anchored securely to the structure using expandable bolts.
Each block includes a through-hole for M8 anchors and tightening nuts for secure installation. The distance between the grooves on the two blocks is measured using a digital inside caliper with a resolution of 0.01 mm, providing highly accurate readings of crack width changes over time.
The EDJ-41M is ideal for use in tunnels, dams, retaining walls, heritage structures, and rock slopes, offering a robust, field-proven design with straightforward manual measurement.
Specifications
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Instrument type: Crack Meter
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Sensor type: Mechanical (manual measurement)
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Configuration: Two stainless steel datum blocks with reference grooves and mounting anchors
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Application: Monitoring surface crack movement on concrete, masonry, or rock structures
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Measured parameter: Crack width / joint opening
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Measuring range: Up to 150 mm
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Testing & calibration: Not applicable (manual measurement using digital caliper)
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Key features:
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Simple, rugged, and corrosion-resistant stainless-steel construction
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Easy to install and operate using standard expansion anchors (M8)
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High accuracy — measurement resolution of 0.01 mm with digital caliper
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Suitable for long-term or periodic crack monitoring programs
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Maintenance-free and reliable under harsh environmental conditions
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