I also have a Walgreens Pulse Oximeter [that thing that has replaced a tongue depressor these days] that tells the tale if all is as well as it can be.
YMMV
I thought the tongue depressor was to look at the tonsils. I have a thermometer, pulse oximeter, a BP cuff device, some bandaids, antiseptic liquids and ointments, and a roll of bandage wrap. The rest I leave to the butchers and mechanics.