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Throughout the 1940s to well into the 1990s the company focused on making signal generators, voltmeters, oscilloscopes, counters, and other test equipment.
Their distinguishing feature was pushing the limits of measurement range and accuracy. For instance, almost every HP voltmeter or signal generator has one or more extra clicks of its knobs than its competitors.
HP meters would measure down and up an extra 10 to 100 times the units of other meters. Although there were good reasons why competing meters stopped at 1 volt full scale, HP engineers developed ways of extending the range of their equipment by a considerable amount. They also focused on extreme accuracy and stability, leading to a wide range of very accurate, precise, and stable frequency counters, voltmeters, thermometers, and time standards.