Order a separate firebrick top with 2″ x 2″ high-temperature window for a Caldera that you already own. It installs in minutes.
Watch the bright red kiln interior through the window. (The glass is rated to 2300°F.) This is especially convenient for glass fusing. Watch your glass treasures progress through every stage from tack fuse to full fuse. (Note: always wear firing safety glasses when viewing the kiln interior.)
Note: The Caldera will not reach its maximum temperature when equipped with the glass window. To reach maximum temperature, fire the Caldera with the plain lid.