Since the caliper readings are in reference to zero, a reading of 019 (or, more accurately, 0.019) is the smaller of the two. This reading is "nineteen thousandths of an inch".
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030 is 30, which is a number in the decimal system.
.0030
A ford 302/5.0 will be 306ci if bored .030 (4.030" bore)
0.2
.030 inches is equal to 30 thousandths of an inch. This measurement can also be expressed as 30 mils, where one mil equals one thousandth of an inch. In decimal form, it remains 0.030 inches.