Fowler's Ultra-Cal III Electronic Depth Gage with Hook Improved electronics with Direct RS232 Output. This computerized measuring tool combines the advantages of Fowler's "Ultra-Cal III" Swiss patented measuring system with the rugged design of a full 12" capacity depth gage. Together this replaces conventional vernier and dial depth gages and depth micrometers. Low drain, high efficiency lithium wafer battery (environmentally safe for disposal) offers 4500 hours of continuous on-time. Life extended 2-3 years with use of on / off switch. Features include... 0-12" / 300mm Measuring Range 0.0005" / 0.01mm Resolution 6" Base Length 0.300" Base Width 0.637" Beam Width 0.120" Beam Thickness 0.584" Hook Length SPC Output For data output to a PC... Use the 54-115-525 USB Direct Cable