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Length Comparator for precise measurement of length changes in 10in (254mm) cement, mortar, and concrete specimens, and includes an Invar Reference Bar for exact zeroing of the dial or digital indicator. Stationary and movable anvils fit HM-268 Gage Studs cast into test specimens. Available models are equipped with either a dial or digital indicator mounted on a sturdy vertical support stand attached to a triangular base with an adjustable terminal and collar.
Designed to test specimens up to 4x4x10in (102x102x254mm) cross-section, but 1x1x10in (25x25x254mm) prisms are normal. Inquire for a special adapter and shorter Invar Reference Bar if 5in (127mm) long prism samples are tested.
HM-250D with Digital Indicator is powered with two standard replaceable lithium batteries or AC adapter, each included. The LCD digital display features auto On/Off and can change between inch and millimeter. Its internal memory can store user settings. The range is 0.6in (15mm).
HM-250 with Dial Indicator has a 3.625in (92mm) Dia. mechanical dial gauge marked from 0-10, with a range of 0.4in (10mm) and gradations of .0001in (.003mm).
HM-250: 0.4in (10mm)
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