3M 33440, Cubitron II File Belt, 33440, 80+, 10 mm x 330 mm (3/8 in x 13 in), 7100033195, 10 belts per carton, 5 cartons per case 
Insize 1187-200AWL, DIGITAL OUTSIDE NECK CALIPER, 0-8″/0-200mm, built-in wireless, 6940561959871
$463.57
Resolution .0005″/0.01mm
Measure grooves and recesses.
Buttons: on/off, zero, inch/mm.
Automatic power off, move the digital unit to turn on power.
Battery CR2032.
Made of stainless steel.
Optional accessory: depth stop (part no. 6143, for caliper with e=.63″
