Calculators; Micrometers; Carpenter's levels; Carpenters' rules; Distance measuring apparatus; Dust masks; Earphones and headphones; Flash lamps; Folding rulers; Gloves for protection against accidents; Graduated rulers; Measuring rulers; Photographic flashbulbs; Safety goggles; Slide calipers; Surveying instruments; Surveyors' levels; Tape measures; Tripods for cameras; Weighing apparatus and instruments