The Aluminum Microplate Tray serves as a heat sink and temperature stabilizer for microwell plates. The plate has six recessed slots for microplates. Standard covered microplates incubated in the tray experience less variation due to even heat distribution. This temperature consistency will help to lower variation in cultured cells and related cell-based assay. When the tray is used with the Microplate Stability Chamber, the edge effect so commonly observed with cells cultured in 96 well plates is almost eliminated. Note that the Stability Chamber is supplied with an Aluminum Microplate Tray.