hp or Hewlett-Packard started as a T&M Firm. Agilent Technologies continued the Instrumentation Products after hp became a computer company. Now Keysight Technologies is the new name for the Instrumentation Division. Agilent now is a Life Sciences company.
The company, founded in 1946 by Joseph F. Keithley in a Cleveland, Ohio, workshop, designs, develops, manufactures and markets complex electronic instruments and systems geared to the specialized needs of electronics manufacturers for high-performance production testing, process monitoring, product development and research. Now part of Tektronix.
SpenceTek markets and services high quality test and measurement instruments manufactured by Topward Electric Instruments. Products of Topward include DC power supplies with a total of 68 models for voltage up to 60V and current up to 10A. Function Generators and Digital Multimeters. Digital Ammeters, Watt-meters and Frequency Counters. They also have Oscilloscopes and LCR Meters.
LabSmith was founded in 1995 by Dr. Eric Cummings, whose work at Caltech and other institutions exposed the need for a new approach to research equipment design. LabSmith has introduced entirely new classes of equipment, such as high voltage sequencers, real-time recording fluorescence microscopes, uProcess Aautomation products, including syringe pumps and valves, and breadboard-based microfluidics components.