The high precision vacuum exposure unit has been especially designed to work with APM photoresist materials. It's sturdy steel case houses 6 superactinic 20W UV tubes and incorporates special reflectors for minimum undercut. The artwork and film are held together in a sturdy frame with the assistance of a maintenance free vacuum with gauge display. The digital timer can be set from 1 second to 99 minutes and benefits from a count-down, auto-reset and beeper. The maximum exposure area is 57cm x 30cm.