The text you provided appears to be a product description for a Demountable Mechanical Strain Gauge, a precision instrument used in civil engineering and materials testing to measure strain (deformation) in structures like concrete, masonry, or steel components. These gauges are mechanical (non-electrical) and designed to be easily attached and removed without permanent installation, making them ideal for field inspections, crack monitoring, or load testing. Available in 100 mm, 150 mm, or 200 mm, measured between the reference pins. This allows for flexible application on different surface sizes. dial gauge Resolution of 0.002 mm over a 5 mm range. Digital dial gauge Resolution of 0.001 mm over a 25 mm range (higher precision and extended range).