• Lid with an air-venting system for controlled gas exchange with low evaporation• Vented base for air flow between stacked dishes to prevent condensation• Sloped edge allows placement of the lid in one position only• Yellow inscription field: yellow on yellow - match!• Surface-activated growth area on spherical zone of well only• Crystal clear transparency for excellent viewing• Black alphanumerics for quick identification of the wells• Clear alphanumerics between wells for orientation during microscopy