Top Left. The lid of the chamber give an access for a thermometer to check the fluid temperature.
Top Right. A digital display of the temperature, pH, duration of the tissue experiencing low/high temperature, warning signs, etc significantly helps the user know the tissue's condition.
Middle Right. A vacuum access to allow a vacuum to take out air that might contaminate the tissue.
Bottom Right. The sides of the chamber have slits on the walls which allows the top layer to be adjustable in height. But this causes the top layer to unstable.
Bottom Left. A sketch of all the features combined.