Profile: APIS, Inc. specializes in offering metrology tools and test equipment. Our products include gage block sets, micrometers/calipers/small tools, standard & special thread gages, micrometer & vernier masters, plain ring & plug gages and granite surface plates. It also contains surface plate stands, air gage instruments, thread & gear measuring wires, digital & dial indicators, optical comparators, sine plates, precision angle plates and hex gages.