3M 463-000-TRI-4, Pro Grade Precision Comfort & Performance Large Sanding Tool, 3.7 in x 7 in, 7010416697 
Insize 2197, LARGE RANGE DIGITAL RADIUS GAGE, R1(4-590″/100-1500mm), R2(4-590″/100-1500mm), 697409778087
$4,148.69
Resolution .001″/0.01mm
Measure radius of internal or external arcs
Buttons: on/off, hold, mm/inch, s(select jaws), zero
Display can be rotated by 320?
Supplied with 4 jaws for different sizes of arc
Battery CR2032, automatic power off(time is adjustable)
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