how to read this picture TEMPEREC 8 995793 RI 11 11 21 1 51

how to read this picture???

TEMPEREC 8 99-579-3 RI 11 11 21 ]1 51 .80 Bro & Sharpe 20 70 -Mk- .001\', 30 SHOCKPROOF SWISS MADE 40 60 50 .

Solution

It\'s Dial caliper...

Each small division of dial caliper is .001\'\'

THe shown measurement= 1.5\'\' in main scale + dial caliper reading.

Now dia caliper reading is 90 small division = 90*.001\'\'=.09\'\'

So total reading = 1.5+.09=1.59\'\'