Abstract: An adhesive backed covering for use on a microtiter plate is disclosed. The covering comprises labels printed or embossed thereon which will align on top of individual wells when the cover is placed onto the microtiter plate. Preferably each label will be unique to uniquely identify each well of the microtiter plate. The use of these covers aids in the manual identification of individual wells of microtiter plates thereby minimizing human error. Preferably the covers can easily be penetrated by a pipet tip or other extraction device, such as a wooden applicator or toothpick, to allow easy access to individual wells while protecting other wells which remain sealed.