I've been in medical diagnostics field service for approximately 15 years and in my experience talking with recruiters, interviewing, and hiring for my current employer I will tell you that field service salaries vary greatly. Currently the low end, entry level salary at a large laboratory diagnostics supplier seems to be around 50K and can be upwards of 100K total compensation for experienced engineers. However, you can see quite a bit of variance even between engineers with similar experience and backgrounds. My company has only hired experienced (5+ Yrs) engineers over the past four years and we expect to pay 65-75K as a base for a salaried engineer. I personally know of hourly FSE's that have been around for sometime breaking 120K but I would say that that is the high end. Hourly positions and unlimited overtime are much harder to come by in the current climate.