Laboratory sample heating and evaporation vessel; laboratory sample heating and evaporation vessel for scientific use; laboratory sample heating and evaporation vessel for scientific use, namely, analysis of a sample; heating and evaporation rack for digestion tubes for scientific use; heating and evaporation rack for digestion vials for scientific use; heating and evaporation rack for digestion tubes for scientific use, namely, analysis of a sample; heating and evaporation rack for digestion...