So-Low 2406 CO2 Incubator was designed and manufactured to accommodate tight budgets, while maintaining the fundamental needs of quality and precision. These units have PID microprocessor controllers, a heated outer door and a tempered-glass inner door. They provide exceptional temperature uniformity, while minimizing cold spots that lead to condensation and ultimately, contamination. Although they do not have a humidity display, the extremely stable temperature environment maintains constant humidity through evaporation at 95%. Double wall construction reduces this unit's footprint, so they fit in tight spaces as well as tight budgets. The audible/visual alarms for temperature and CO2 respond to out-of-tolerance conditions. They offer an independent over temperature safety control to protect samples from overheating, and an optional CO2 tank switch/alarm to prevent prematurely exhausting the gas supply.