Everything from Valco Instruments, where the founder and CEO (Stan Stearns [0]) launched using his own engineering designs and continued to maintain a prototyping bench indefinitely, long after he had numerous gifted engineers employed.
Not familiar with the hardware that Vici sells, but it sounds like you'd be describing HP test equipment if you were describing tools used by EEs and techs.
[0] https://www.vici.com/heritageaward2020/