optical and measuring instruments, namely, electronic and non-electronic precision measuring devices consisting of spirit levels, combination squares, engineer's combination squares, V blocks, magnetic stands, comparator stand, engineer's squares, marking gauges, divider, protractors, sine bars, edge and center finders, dial gauges, rulers, angle plates, magnets, height gauge, vernier caliper, micrometers, dial calipers, gauge blocks, dial indicators, microscope and hand-held optical magnifier