plumb bob, pencil, trigonometry, logarithms, allen wrench, theodolite, crochet hook, countersink, geometry, hypotenuse, tetrahedrons, quadratic equation, multimeter, grease pencil, differential calculus, goniometer, cosine, stud finder, polynomial, sextant, pythagorean theorem, spherical geometry, trig, clove hitch, rhombus, equilateral triangle, brads, radians, dodecahedron, voltmeter, sketchpad, awl, pinking shears, vernier, inclinometer, calculators, compass, pancake turner, scotch tape, electric sander, styli, decimals, highlighter, fletching, needlenose pliers, tachymeter, colorimeter, isosceles, freehand, mercator projection, thumbtack, eyepieces, potholder, adz, manometer, parallelograms, gameboard, ballpoint, reamer, adjustable wrench, loupe, tongue depressor, caliper, chamfer, abacus, ellipsoids, torque wrench, yantra, eggbeater, spirograph, knitting needle, breadboard, watchband, straightedge, oarlocks, diagram, algebra, stopwatch, spectroscope, dowel, armillary sphere, integrals, magnifying glass, garter stitch, algebraic, combinatorics, linear algebra, socket wrench, mandoline, pegboard, balsa wood, refractometer, jotter, theorems, pen nib, hydrometer, sphygmomanometer, precalculus, bevels, pendulums, flashcard, rectangles, nozzle, magnet, micrometer, turntable, projector, rack, winch, axle, bobbin, condenser, eyepiece, galvanometer, jacks, pump, racks, template, vise, washers, aerial

drafting instrument