Answer:

microscope

AnswerCrossword Clue
MICROSCOPEBio lab instrument
MICROSCOPEBiology instrument
MICROSCOPEGift for someone observing a 48th anniversary?
MICROSCOPELeeuwenhoek creation
MICROSCOPEMeasure of a small amount of mouthwash?