There's not, but in general one would guess they use the machine during their work. If a machine is expected to put in an 8-12 hour workday, whether it's a comp

There's not, but in general one would guess they use the machine during their work. If a machine is expected to put in an 8-12 hour workday, whether it's a computer, car, truck, power tool or whatever, it needs to be able to handle operation at full load for extended periods of time. Adequate cooling, lubrication, duty cycles, lifespan and so forth should be considered by the manufacturer's engineers before they slap the "Pro" label on anything.