The ruler function of Apple's mobile phone is very practical, and it can easily measure the length, width and height. But many users don't know how to open this function, which will be introduced in detail below.

Step 1: Find the Measure application.

The "measurement" application that comes with Apple's mobile phone is the entrance to the ruler function. On the main screen interface, you can search for the "Survey" application through the search function or in the application list. If you can't find it, you can go to the AppStore to download and install it.

Step 2: Turn on the ruler function

In the Measure application, you can see several options at the bottom of the screen, including Measure, Level and Body Measure. Click the "Measure" option to enter the ruler function.

Step 3: Use the ruler function

After entering the ruler function, you can see a horizontal ruler above the screen and a white measuring box below. Aim the mobile phone at the object to be measured, aim the edge of the object at the measuring frame, and then click the "+"sign on the screen to start the measurement. Move the mobile phone so that the measuring frame covers the whole object until the length of the object is displayed on the screen.

Ruler can measure not only length, but also area, volume and so on. After measuring the length, click the+sign on the screen, select the option of "area" or "volume", and then follow the prompts.

The ruler function of Apple mobile phone is very practical, which can help users to measure various sizes conveniently. As long as you follow the above steps, you can easily open and use this function.