Temperature 5''C to 50°C in one chamber. In the other chamber temperature range temperature to 50°C. Temperature controlled by hydraulic type thermostatic var iation of plus minus 1 °C Each chamber has i 4 trays. Each charnber has staimecs steel water reservoir at bottom. Humidity from 90 to 95% plus minus 3 % (not adjustable ) Double-walled inside made of anodized Aluminium and outside Mild Steel painted in epoxy powder coating to work on220/230 volts 50 cycles A.C. only.