Multifunctional: can be used as an evaporating dish, can be used as a lid, can be used as a container, can be used as a carrier,beaker cover,watch glass
: glass, can use it with confidence,evaporating dish covers,chemistry glass equipment
Thickened watch glass--can be used to do some evaporation of , but can't be heated like an evaporating dish,beaker cover
Accessories--can be used to hold ph tester, temporary liquid holder,beaker cover
Laboratory glass equipment--the is favorable and the material of choice for the laboratory,beaker cover