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Reference Level for Ruska piston gauges (L1 and D values)

The true reference plane of the piston gauge is the effective bottom of the measurement piston.
This location can be correlated to the top of the sleeve weight using the L1 dimension (found on Calibration Report for the Piston/Cylinder) and then correlated to the bottom of the sleeve weight using the D Dimension (found on Calibration Report for the Mass set).

The total length of travel for a 2465 piston is 0.5 inches (12.7 mm).

More diagrams from the 2450 manual related to head height (h) and zeroing while vented...

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