The outer chamber is made up of M.S. Sheet duly painted and inner chamber of thick S.S. Sheet. The gap between two walls is fitted with high grade glass wool to avoid thermal loss. The plexi glass window makes it possible to inspect the specimen without disturbing the inner temperature. The lid of chest type unit is fitted with fluorescent tubes of 60 cms, Length, on the inner side. The unit has a temperature range From 5°C. When the tube lights are ON temperature range is from 10°C to 50°C, A circulation fan is fitted to maintain temperature uniformity throughout. Cyclic illumination conditions are controlled by an automatic Timer (0- 24) fitted to the unit. It is fitted with DIGITAL SPEED METER (RPM COUNTER) for shaking Platform having VARIABLE SPEED. The shaker has variable speed and a platform containing 16 flasks of 500ml or 40 flasks of 100 ml or 34 flasks of 150 ml capacity is supplied with the unit as standard accessory. To work on 220/230 volts A.C. Supply.