the stethescope, when used with a special inflatable cuff and dial, can also be used to check a persons blood pressure.
which word if added to the eggining will help understand that another use for the stetscope is going to be disscussed
and
then
however
so
and would be the simple answer. It indicates additional information is forthcoming.
Context is everything though, The cranial saw is pretty much a one use tool, however the stethoscope....
Yes that example of mine is hideous, I am just using it to show how what came before is critical to the final word choice.