I work on utility equipment. They put one on the engine and one on the pto. Its just another way of knowing the conditions that the actual piece of equipment is being operated .
I find some mid 90's trucks with 20,000 miles on them then look at the hour meter and the brand new low mileage truck suddenly becomes a POS . It has Idled 8 hrs a day for the past 15 years !!
Some fleets go by hours others by odometer or months depends on the manager / owner .
All new vehicles have an internal Life hour meter I guess you could call it. Dealers can bring it up on their scanners.
Unless you have major problems with your odometer I wouldnt worry about it.
And we all know these mercedes have the most accurate odometers. 
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Experience : what you receive 3 seconds after you really needed it !!
86 300SDL 387,000? Motor committed suicide
81 300SD 214,000 "new" 132,000 motor
83 300SD 212,000 parts car
83 300SD 147,000
91 F700 5.9 cummins 5spd eaton 298,000
66 AMC rambler American 2dr auto 108,000
95 Chevy 3/4 ton auto 160,000
03 Toyota 4runner 180,000 wifes
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