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.
"From a small garage in Palo Alto, California, to employees around the world serving customers in 110 countries, Agilent has a long history of innovation and leadership in the communications, electronics, semiconductor, test and measurement, life sciences and chemical analysis industries."
The company founded by William "Bill" Redington Hewlett and Dave Packard was know as Hewlett-Packard Company or HP. This was a Test and Measurement company. First popular product was a precision audio oscillator, the Model HP200A.
Later Computer and Printer products divisions retained the brand and firm and Agilent was spun off for for the Test and Measurement and other non-computer product line.