You can measure 3.2 inches on a US tape measure in a couple of ways:

1. Using the Subdivisions:

* Most US tape measures are divided into 16ths of an inch. Find the 3-inch mark and then count over 3 of the 16th inch markings (since 0.2 inches is equal to 3/16 of an inch).

2. Using the Decimal Markings:

* Some tape measures have decimal markings. Look for the 3-inch mark and then find the line that corresponds to 0.2 inches.

Here's a visual representation:

Imagine a tape measure. Find the '3' mark. Now, if you see 16th inch markings:

* Count three markings to the right of the 3. This is 3 3/16 inches, which is equivalent to 3.2 inches.

If your tape measure has decimal markings:

* Look for the line that indicates '0.2'. That mark will represent 3.2 inches.

Important Note: It's best to have a tape measure that has clear markings for the desired precision.