Designed to create a stable, reliable environment for cell culture applications. It operates at temperatures ranging from 5°C above ambient to 60°C±0.2°C. There is a 1¼" access port located at the rear wall of the chamber. Thermal Conductivity sensor. In-chamber HEPA air filtration system maintains Class 100 air quality. Microprocessor allows control of CO2 level (TC sensor) and provides readout of chamber's relative humidity. Humidity can be added through the use of a pan with water at the base of the chamber but this is non-controlled humidity.