Cast Iron Length Comparator

Material: Rigid cast iron or steel frame
Measuring Range: Up to 10 mm (expandable with accessories)
Dial Gauge/Indicator: 0.001 mm or 0.01 mm least count
Reference Bar: Invar or stainless steel reference rod included
Specimen Compatibility: Cement, mortar, or concrete specimens (prism/bar type)
Specimen Size: Typically 25 mm × 25 mm × 285 mm or similar
Application: Measures length changes due to shrinkage or expansion
Support: Adjustable anvil and holder system for stable positioning
Compliance: As per ASTM C490 / IS 4031 standards
Usage: Dimensional stability and shrinkage testing in materials labs