Rare find, the item was bought in 1986 but has never been used. The centre head is still sealed in its original packaging. 

Mitutoyo is the benchmark brand for measuring tools and offer some of the highest levels of accuracy on the market.

Mitutoyo 180-910 Combination Square Set 300mm 4pc Blade Sq Head Center Head Protractor Head.

The Mitutoyo 180-910 Combination Square Set, 300mm Rule, Square Head, Centre Head and Protractor Measuring head is attached to the graduated steel rule (blade), allowing versatile measurements on various types of workpieces The measuring head is hardened and ends fully rounded to give accurate contact with a workpiece.

Square head: Used to set the rule at 90 degrees or 45 degrees to an edge of a workpiece.

Center head: Used to locate centers of round workpieces

Protractor head: Used to set the rule at a desired angle to an edge of a workpiece. Also used for measuring angles.