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bevel - rule with adjustable arm that opens to form measured angles, used for drawing or shaping sloped edges
butt gauge - gauge with three cutters for marking mortise outlines, as for door butts
caliper - adjustable, often curved jaws on pivot, used for measuring thickness or diameter
center punch - small device with conical point for marking shallow impressions, used to center drill bits for making holes
combination square - adjustable device used as level, miter square, and try square
compass - instrument consisting of two movable legs hinged at one end, used to draw arcs and circles
dividers - pair of compasses used to measure lines or divide a large space into sections
feeler gauge - device for measuring gaps by inserting one of several arms of different thicknesses
folding rule - measuring device with multiple, pivoting lengths for compact storage
level - any of various devices for determining true horizontal lines, esp. one that has a bubble suspended in liquid in a glass tube set in a long straight board
marking gauge - any device for marking measurements with a sharp point, usu. having graduated scale on sliding arm
micrometer - precision instrument with spindle moved by finely threaded screw, used for measuring thicknesses and, by machinists, for turning shafts and boring holes
miter box - fixed or adjustable guide for saw angle, used in making a miter joint or crosscut
miter square - two straightedges joined at a 45-degree angle
plumb bob - weight hung on line, used to determine true vertical line; plummet
plumb rule - narrow board with plumb line and bob suspended from upper edge, used to determine verticality
scale - any of various devices for determining weight of objects
scratch awl - long blade tapering to sharp point for making fine marks
screed - wooden strip that serves as guide for making a true level surface, esp. by dragging it across freshly poured concrete
scriber - pointed tool for marking wood as guide for cutting or assembly
slide caliper - pocket caliper with ruler along which one arm slides
square - any instrument with straight edges and at least one ninety degree angle, used to plot right angles
straightedge - length of straight, rigid material for measuring or marking; rule
tape measure - narrow strip of flexible material, often in coil, marked off in measuring units
try square - pair of straightedges fixed at right angles to one another, used to lay out right angles or test squareness
T square - rule with perpendicular crosspiece at one end, used for marking parallel lines
turning caliper - caliper into which a cutting or parting tool fits, used to make repetitive sizing cuts in turning
vernier caliper - caliper in which two pieces slide across one another, one piece having a movable, graduated scale running parallel to the scale on the other piece
wing divider - device consisting of adjustable arms and a graduated gauge for dividing lines and scribing circles