General Tools & Instruments LLC is a global leader in manufacturing high-quality hand tools, digital tools and instruments for various precision measuring, facility maintenance, plumbing, inspection and mechanical work. The General Tools catalogue meets ETL, FSC and SAE standards and includes over 1000 plumbing, woodworking, inspection, precision measuring and inspection tools used by tradesmen, craftsmen, DIYers and mechanics. The Measuring Tools category by General Tools comprises of calipers, micrometers, squares, protractors, gauges, thermometers, moisture-meters, psychrometers, measuring tapes and compasses. Calipers are used to make inside, outside, depth and step measurements in inches or millimeters. They are available in vernier, dial, digital and spring caliper variants with different measuring ranges and accuracies. General Tools thermometers are used to measure ambient and surface temperatures, and are available in contact and non-contact models with options in dial and digital readouts. Raptor Supplies offers a variety of these General Tools in different ranges and accuracies.