b'e lectronicb oreg ages770 e lectronicb oreg ages witHip67 p rotection( witH output )See specifications on previous page770BXT Electronic Internal Micrometer Sets, 2-Point Contact (.080-.250" [2-6mm] Range)RangeCat. No. EDP in mm Number of Heads Number of RingsS770BXTBZ 72576 .080-.250 2-6 5 3aGes ore770BXT Electronic Internal Micrometer Sets, 3-Point Contact (1/4-8" [6-200mm] Range), Fixed anvils industry 4.0RangeCat. No. EDP in mm Number of Heads Number of Rings G BS770BXTCZ 72577 1/4-3/8 6-10 2 1S770BXTDZ 72578 3/8-3/4 10-20 3 2S770BXTEZ 72579 3/4-2 20-50 3 2S770BXTFZ 72580 2-4 50-100 3 2S770BXTKZ 72581 4-6 100-150 2 1S770BXTGZ 72582 4-8 100-200 4 2S770BXTLZ 72583 6-8 150-200 2 1S770BXTKZi nreacHe xtensions For770b, 781b, 781 b oreg agesExtensions from 2-1/2 - 6" can be added to both the 770BXT and 78XT, enabling internal measurements in deep hole bores (Multiple extensions can also be used).Internal ExtensionsExt. Size Model SizeCat. No. EDP in mm Fits Models in mm78/782F 65484 2.5 63 78XT, 770BXT, 781BXT312-375 1/4-3/8 6-1078/782G 65485 3 75 78XT, 770BXT, 781BXT375-500 3/8-1/2 10-12.578/782H 65486 4 100 78XT, 770BXT, 781BXT625-750 1/2-3/4 12.5-2078/782J 65487 6 150 78XT, 770BXT, 781BXT1 thru 2 3/4-2 20-5078/782K 65488 6 150 78XT, 770BXT, 781BXT2 thru 12 2-12 50-30078-782J with 770BZ-2starrett.com 41'