The controller is designed around a new generation of switching power supplies which are smaller and lighter than the older BFS supplies. The supplies are overrated 100% to ensure cool operation and continuous service.

• Fast freezing preserves cell detail
• Frozen tissue sections from most microtomes
• Continuous display of both set and run temperatures
• Simple digital temperature control set-up
• Auxiliary switched AC output for accessories
• Temperature control to within 0.5 °C in the range of ‒40 °C to ambient.
• Thaw switch to quickly release frozen samples
• No CO₂ needed - minimal cost to run

Safety features include overtemperature alarm with power shut down in the event of inadequate flow of cooling water or overuse of the thaw feature. Controller incorporates fan assisted internal cooling to maintain low internal component temperatures. P.I.D. microprocessor based temperature controller with autotuning feature and feedback sensor breakage alarm. Adjustable feet provide convenient viewing angle for display.

BFS-40MPA stage design incorporates several innovative features. An etched grid on top plate promotes better adhesion of frozen sample. Thinner stage design reduces the need for a knife raising block. Waterways inside the stage are redesigned to create a single passage to improve heat transfer and reduce potential for blockage. Redesigned mounting hardware facilitates the direct attachment of blocks or posts to the underside of the stage and a new adapter plate system allows mounting on a variety of different microtomes.