Abstract: A level or pitch measuring instrument of composite metal and plastic construction. A metal frame or base of T-shaped cross-section includes a first planar working surface and an upstanding web portion. Means are provided for mounting vials in the web in precise preselected angular relationship to the planar working surface. A plastic second planar working surface element is assembled to the frame or base to maintain preselected axial alignment of the vials with the plane of the web. Simultaneously, the vial orientation on the frame or base will permit coaction of metal and plastic elements to position the plastic planar working surface in a predetermined relationship to the metal planar working surface. Openings are provided in the plastic and metal elements to permit lateral vial viewing through the web and vertical viewing of plural vials through the plastic working surface.