Interesting point diesel85. I believe the hour meters on equipment usually record the hours at rated rpm, so low rpm operation will result in less hours than actual operating hours. Hour meters are intended to record level of use on internal wear components like pistons on cylinders, shafts on bearings, etc. Other components on a vehicle may get a different use history.
Nope, I measured the on my BX. 1 hour on the meter = 1 hour in real life no matter the RPM. I know on the older machines, it was like that, where it would vary with RPM. Some of the huge machines are like that -- actually some have dual or triple hour meters - idle meters, usage meters, and total hour meters. I know on some of the newer light and medium duty consumer pickup trucks, they are starting to come with idle meters and total hour meters.
On cars, I would rather see an hour meter than mileage. Hours tells me a lot more than mileage. Based on what I know and understand now. Mileage is OK, but it's really not a good classifier in my books.
Just like my Jeep, if I were to sell it right now, I don't need to disclose how many hours are on it, all I need to report is that it's got ~200k on it. But if the buyer knew it was driven mostly in the city at a crawl of 25 mph, with 8000 hours on it, I'd guarantee they'd steer clear of it if they were smart.
Give you an example, ask anyone that is looking to buy retired PI Crown Vics. No one looks at the mileage, they all look at the hour meters they have. The less hours, the better. Even it's got 200k on it. They'd rather have it with low hours and high mileage. Or preferably both, low mileage and low hours.
Another example of this is at my work. We got several service trucks (F-350s & Chevy 3500s) that have less than 20k on them when we retire them. But they got 15000+ hours on the engine. So selling them on eBay for 20,000 miles, you'd think you are getting a deal, when you are getting worn out junk. Legally we don't have to put the hours on the eBay listing, because it's not required for registration. No state I know of looks at hours instead of mileage.
But for most people that don't use their vehicles kind of like tractors where they idle them a lot or use them as consistent service vehicles, it might be unnecessary. I don't know... but it's still nice to know.