fig1 and 2 show a preferred embodiment of measurement device 10 of the present invention . the measurement device 10 includes a face probe 20 , a probe arm 30 , a retaining tube 40 , a retaining arm 50 , a spacer 60 , a clamp 70 , two tightening bolts 80 , 85 , and two gauges 90 , 95 . fig3 and 4 show close - up views of the face probe 20 , which includes a centrally - located sighting hole 210 , three arms 212 , 214 , 216 , and a stem 218 . fig3 shows that the stem 218 and one of the arms 214 include horizontal touch points 220 , 222 disposed across from one another with the sighting hole 210 between them . fig4 shows that two arms 212 , 216 include vertical touch points 230 , 232 disposed across from one another with the sighting hole 210 between them . fig5 shows that the face probe 20 and probe arm 30 are formed as a unitary piece as shown in fig1 and 2 , the probe arm 30 is threaded through the retaining tube 40 , which connects the probe arm 30 to the retaining arm 50 . when tightening bolt 85 is loosened , the probe arm 30 can rotate within the retaining tube 40 and thus enable the face probe 20 to flip over to expose the side having horizontal touch points 220 , 222 or the side having vertical touch points 230 , 232 . the probe arm 30 can also move in and out of the retaining tube 40 when tightening bolt 85 is loosened . tightening the tightening bolt 85 will prevent the probe arm 30 from rotating and moving in and out of the retaining tube 40 , and will fix the face probe 20 at a desired orientation with respect to the rest of the measurement device 10 . tightening bolts 80 , 85 are shown in more detail in fig7 . as shown in fig6 , retaining tube 40 comprises a tube piece 42 and a connector piece 44 that extends from the tube piece 42 at an acute angle α . connector piece 44 is slid into the opening 55 of retaining arm 50 , shown in fig8 and 9 , and tightening bolt 80 is fitted within bolt hole 82 and tightened to retain connector piece 44 within retaining arm 50 at a desired location . loosening tightening bolt 80 allows the connector piece 44 to slide in and out of retaining arm 50 and to rotate within retaining arm 50 , which consequently allows tube piece 42 to rotate . rotation of tube piece 42 when the probe arm 30 is inserted within tube piece 42 causes the probe arm 30 ( and therefore the face probe 20 ) to pivot towards or away from a golf club face . as shown in fig8 and 9 , retaining arm 50 is preferably integrally formed with a spacer 60 , which helps to locate the face probe 20 in front of a golf club face . in alternative embodiments , the retaining arm 50 and spacer 60 may be separate pieces that are connected through other means . fig8 and 9 also disclose clamp 70 , which in the preferred embodiment includes two clamping mechanisms 72 , 74 that are affixed to the spacer 60 after retaining arm 50 and spacer 60 are integrally formed . in alternative embodiments , the clamp 70 may comprise one or more than two clamping mechanisms , and may be integrally formed with the retaining arm 50 and / or the spacer 60 . fig1 and 11 illustrate the gauges 90 , 95 of the preferred embodiment . fig1 shows gauge 90 where the probe arm 30 is inserted in the tube piece 42 of the retaining tube 40 . the probe arm 30 has markings 100 on it that indicate , when the measuring device has been used with a golf club head , the angle of the golf club face with respect to the golf club shaft and the distance of the center of the golf club face from a shaft axis or other points on the golf club , for example . fig1 shows the gauge 95 where the connector piece 44 of the retaining tube 40 is inserted through the opening 55 of the retaining arm 50 of the measuring device 10 . the connector piece 44 also has markings 110 on it that indicate , when the measuring device has been used with a golf club head , the angle of the golf club face with respect to the golf club shaft and the distance of the center of the golf club face from a shaft axis or other points on the golf club , for example . the gauges 90 , 95 may also measure additional or alternative features of the golf club orientation . fig1 illustrates how the measuring device 10 is assembled with respect to a golf club head 300 . clamp 70 and tightening screws 80 , 85 are omitted from this figure for purposes of clarity . fig1 shows that spacer 60 is lined up with and flush against a golf club shaft 350 . the connector piece 44 of retaining tube 40 is inserted into the opening 55 in the retaining arm 50 . bolt hole 86 on the retaining arm 50 can receive tightening bolt 85 to fix the connector piece 44 within the retaining arm 50 . the unitary piece comprising the face probe 20 and probe arm 30 is then inserted , probe arm 30 end first , into the tube piece 42 of the retaining tube 40 . bolt hole 82 on the tube piece 42 can receive tightening bolt 80 to fix the probe arm within the tube piece 42 . the near - fully assembled measuring device 10 illustrated in fig1 is then adjusted to the golf club head 300 to take orientation and geometry measurements of the golf club head 300 . fig1 shows a process for taking measurements using the preferred embodiment of the present invention . first , a center 310 of the golf club face 320 is located and marked . this marked center 310 represents a point from which measurements will be taken using the measuring device 10 . the measurement device is then aligned with ( and attached to , via the clamp 70 ) the golf club shaft as shown in fig1 . the face probe 20 is then rotated , using the retaining tube 40 , so that horizontal touch points 220 , 222 are facing the club face 320 . the face probe is then 20 adjusted by moving the face arm 30 in or out of the retaining tube 40 so that the face center 310 of the golf club face 320 is visible within the sighting hole 210 of the face probe 20 and the horizontal touch points 220 , 222 are both resting on the face 320 on opposite sides of the sighting hole 210 . tightening bolts 80 , 85 ( not shown ) can be tightened , and then the angle and distance values visible on the gauges 90 , 95 can be recorded . at this point , marks can be placed on the shaft 350 , preferably where the clamps ( not shown in fig1 ) attach to the shaft 350 , to indicate test points for future analysis with , for example , a cmm . if tightening bolts 80 , 85 are used , they are then loosened and the face probe 20 is rotated or otherwise adjusted again so that vertical touch points 230 , 232 are facing and resting on the club face 320 as shown in fig1 and the center 310 of the club face 320 is located within the sighting hole 210 . tightening bolts 80 , 85 ( not shown ) can be tightened , and then the angle and distance values visible on the gauges 90 , 95 can be recorded again . once angle and distance values are measured , the tightening bolts 80 , 85 ( if any ) are loosened and the face probe 20 is adjusted by moving the probe arm 30 through the retaining tube 40 such that one of the vertical touch points 230 , 232 touches a desired toe test point 330 . at this point , angle and distance values visible from the gauges 90 , 95 may be recorded again . after the process outlined in fig1 is completed , the values derived from the measurement device 10 can be input into an impact monitor software program or a cmm for further analysis . the measurement device 10 disclosed herein can measure both loft and face angle at a defined standard of 56 degrees from the shaft axis . alternative embodiments can measure loft , lie , and / or face angles at other angles from the shaft axis . it is portable and easy to use , and identifies where on the club to place markers for use with an impact monitor system . the measurement device 10 also provides the correct geometry relationship between the face center , face plane , golf club body , and test markers on a golf club . the measurement device 10 disclosed herein may be made from a variety of materials known to those skilled in the art , including metals , plastics , and composites . the various pieces of the measurement device 10 disclosed herein may be made integrally or separately and then connected together using methods known to those skilled in the art . the measurement device 10 of the present invention may be used with any type of golf club , and may also be used to measure other sports equipment . from the foregoing it is believed that those skilled in the pertinent art will recognize the meritorious advancement of this invention and will readily understand that while the present invention has been described in association with a preferred embodiment thereof , modifications and substitutions of equivalents may be made therein without departing from the spirit and scope of this invention which is intended to be unlimited by the foregoing except as may appear in the following appended claims . therefore , the embodiments of the invention in which an exclusive property or privilege is claimed are defined in the following appended claims .
a portable golf club face measurement device , which accurately and quickly measures data regarding , for example , the orientation of the golf club face relative to the shaft and the orientation of the golf club face relative to a point located on the toe of the club , is disclosed herein . the measurement device has a face probe , a retaining arm , at least one gauge , and at least one clamp .