Annual outdoor A/C compressor maintenance

Had a new service company come out to do spring A/C maintenance on an older single residential system.
It didn't register until after the guy left but I'm not sure I saw him hook up any hoses/gauges to test the coolant in the outdoor compressor unit.
Is that still part of what they usually do- or is there some new electronic gadget they use now?
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says...

If they did a full service job and not just cleaning the coils they should hook up some hoses/gauges to the unit outside. Also he should have a thermometer that clamps around the lines and another to stick in the air inlet and outlets also.
Did they clean the coils inside and outside ,or just the outside ?
Often on the inside coils they just spray the cleaner on and let the condensed water take care of that.
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The first time you turn on the compressor for the season, you should....
1) make sure the main power has been on for about 24 hours before you actually start up the unit. This is to let the crankcase heater warm the oil and boil out any refrigerant that has migrated into the compressor.
and / OR
2) wait for a warmer day outside so the compressor is warmer then the inside coils.
Liquid refrigerant will migrate to the coldest part of the system. You DON'T want that to be the compressor when you start it. Liquid doesn't compress very well.
m
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