disclosed in which a probe pin forms part of the measuring apparatus to allow the measurement of parts placed on a platform the probe pin of the measuring apparatus may be retracted by a lever pivoting in a bracket fitted detachably to the housing of the apparatus the retracting means fitted with this lever is easy to control and allows parts to be measured quickly application_number US 9336287 A description fig1 shows a general view of measuring apparatus fitted with a probe to which is connected retracting means according to the invention a measuring support 1 has a height adjustable bracket 2 and a platform 3 in this case formed by a circular platform the upper face whereof constitutes a reference surface 4 for the measurement the bracket 2 supports a measurement probe 5 fitted with retracting means 6 according to the invention which will now be described in detail with reference to fig2 to 4 the measurement probe 5 may be one bearing the manufacturer 39 s reference mt 10p 30p and marketed by the company referred to above in a known manner this measurement probe comprises a housing 7 containing the transducer system not shown which in the example described is of the optical ruler type with opto electronic sensor a cylindrical tip 8 integral with the housing projects from it and serves partly to guide the probe pin 9 and partly to fix the probe to the bracket 2 the probe pin 9 is mounted slidably along its axis into the housing 7 at.