3M 45179, Roloc Disc Pad TR, Medium 4 in 1/4-20 Internal, 7000045281 
Insize 4905-B300, FRAME LEVEL, 12″, 6928640378812
$726.46
Sensitivity .0012in/ft (=0.0057?)
No need to set zero before use
V-groove on bottom for shafts (shafts diameter .76~4.56″)
With longitudinal vial
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