Requiring less than 10 square feet of floor space (46× 30-3/4), up to three Certomat BS-1 environmental shaking cabinets can be stacked without any reduction in shaking speeds. Interior chamber offers capacity for up to six-liter Erlenmeyer flasks. All key parameters — speed, temperature and light, time cycles — are user-programmable via digital controller and are displayed on a four line, twenty-character alphanumeric LCD. Advanced programming allows real time control of all cultures. Up to five four-step programs can be stored and password protected. Clean up of accidental spills is easy with a hygienic, highly polished stainless steel interior and removable spill tray. To prevent unauthorized access or tampering, cultures are secure behind lockable doors. Patented shaker drive mechanism with adjustable orbit allows each BS-1 to be converted to either a 25 or 50 mm orbit on-site through a mechanical adjustment to the shaking mechanism. Triple eccentric drive features adjustable mass compensation, for quiet and reliable operation at speeds to 400 rpm even under maximum loads. Built-in refrigeration option enables incubation temperatures near and below ambient. An optional illumination accessory allows the growth of photosynthetic organisms in day and night conditions through simple programming. Every CERTOMAT BS-1 can be customized to individual culture requirements by selecting from an array of accessories including fixed clamp trays as well as universal trays.