Equipment (10) uses a seringe (11) with a tubular body (12) and a piston (14), which is threaded (17) and has a wheel (19) at one end. The tube is fixed on a support (20) which is as well the nut of the piston. This support is integral with a plate (40) with graduations (41). A ruler (22) with index (24) has a base part (23) that can slide on the smooth part of the piston.
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