Object characteristic direct measuring device utilizing a magnetically attracted lover base and an upper frame having a scaled lens therein

An object characteristic direct measuring device, comprising:

• (a) a lower base having an interior cavity and top central opening;
• (b) an upper frame disposed upon said lower base and having a central aperture extending through said upper frame and an annular bottom groove defined in a bottom of said upper frame and surrounding said central aperture thereof;
• (c) means for holding an object to be measured, said holding means being mounted to said lower base and extending upwardly therefrom into said central aperture of said upper frame;
• (d) a transparent lens disposed on said upper frame across said central aperture therein and above said holding means;
• (e) a graduated measuring scale applied on said transparent lens for use in measuring a characteristic of the object held by said holding means;
• and
• (f) means for producing a magnetic attraction between said lower base and upper frame being sufficient to retain said upper frame upon said lower base while permitting rotation of said upper frame relative to said lower base and said holding means mounted thereto for alignment of said measuring scale with a characteristic of the object to be measured, said magnetic attraction producing means includes
• (i) a first magnetic element disposed in said interior cavity of said lower base, said first magnetic element being annular in shape and having a central bore aligned with said top central opening of said lower base and central aperture of said upper frame,
• (ii) a second magnetic element disposed in said annular bottom groove of said upper frame and extending about said central aperture therein and magnetically attracting said first magnetic element in said lower base.