Features of the TPP tissue culture test plates show highest operational standards quality: Opto-mechanical treatment of growth area for optimal cell adhesion Lid with air-venting system guarantees controlled gas exchange with low evaporation Sloped edge allows placement of the lid in one position only Yellow marking area on lid and plate ensure correct lid orientation: yellow on yellow match! Ridged grip area ensures a secure grasp and prevents from accidentally lifting off the lid Clear alpha-numerical labelling between the wells for easy orientation during microscopy Easy to see black alpha-numerics on the side growth area on spherical zone only Absolutely flat growth surface All TPP plate sizes (6, 12, 24, 48 and 96-well) stack securely together Air vents in plate base prevent condensation and provide consistent air-flow between stacked plates Crystal clear transparency Additional advantages of the TPP tissue culture test plates with 96 wells: Manufactured meeting the standards ANSI/SLAS 1-2004 through ANSI/SLAS 4-2004 geometries available: F-base