Description Can be used with Portaray and Sunray to measure exposure time. SUPER Strong Magnetic Back, Loud Alarm, Large Display, Auto Memory, Auto Shut-Off Large easy to read display; easily seen from across the room; Pleasant louder 75-80 decibel mellow 62 second beep can easily be heard in other rooms. Auto shut-off after being idle 2 min. Holds Auto Memory through Auto Shut Off, saving previous setting for next time. Requires (1) AAA Batt INCLUDED;
