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Our special 803-E Invar Kit gives you an economical way to create scale extensions, or build certain types of calibration artifacts, when the only thing that's important is that the length doesn't change between measurements.  We call this type of kit "extension grade" because the length tolerance on the Invar bars is relatively big (±0.050", or ±1.27mm).  The bars are not calibrated, certified, or serialized.  They are simply designed to give you an economical way to hold your scales or other targets while making relative or comparative measurements, but still provide you the benefit of the low thermal coefficient properties of Invar.  These properties effectively eliminate changes in length due to handling or environmental fluctuations.

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Individual components may be assembled to produce lengths from 2" to 112", in 5" increments.   The end of each invar tube allows measuring to the tangents of shafts, and a tooling ball contact point offers the best repeatability on most machine surfaces.  A concave tip is included for use with tooling ball applications.  The table below specifies all included components.  More Invar System components may be seen on this website.