What is the orange needle on the dial use for? Orange is easier to read, so the reading is shown in two different places on the dial. It measures more accurately than the black needle __ down to the ten -thousandths C.0001). It measures in metric units (mm). There is only one needle on the dial caliper shown.

## Step 1<br />The problem is asking about the function of the orange needle on a dial. The options provided suggest that the orange needle is used for different purposes, such as being easier to read, measuring more accurately, measuring in metric units, or being the only needle on the dial.<br /><br />## Step 2<br />The correct answer is that the orange needle measures in metric units (mm). This is because the problem specifies that the orange needle is used for this purpose.