Swanson BLL480 Lighted Box Level, 48"Heavy duty aluminum frame houses industrial strength acrylic block vials and is finished with 'Super Shock' end caps made from a proprietary polymer rubber blend, Deep accurized V groove for round and square stock, Multi ring vials indicate 2 degree and 4 degree grade for drainage Highlights: LED lights on all three vials Auto 10 minute shut off saves on batteries Shock proof end caps Takes 2 AAA batteries 48" Carded