For to long have there been only one way to measure Bowls in a head, down on your knees with your measure tape in your hands, been incredibly careful not to disturb any of the bowls.
But now there is an application that allow you to stand and measure the head. The Bowls Measure application.
With this app you take a picture of the bowls with the jack in the middle. You can either choose between a Line measurement (for two bowls measurement) or Polar Grid Measurement (Recommended for more than two bowls measurements).

Line measuring
You will create two markers between the jack and one bowl. The app will draw a line and measure the length in pixels. You will then create another two markers between the jack and another bowl, again the app will create another line between the two markers and measure that line again in pixels. The shorter of the two lines will mean that that bowl is closer to the jack that the other and is thus the winner.

Polar Grid measuring
Again, a photo will be taken of the head. The application will then create a movable Polar grid over the image. The Polar grid gets centred over the jack and the lines of the polar grid will show which bowl is the closest to the jack.

Functions
You will be able to set the image from colour to grey scale, for better viewing and back to colour again
There are also Contrast and Brightness setting changes to assist with measuring.

You are also able to change the polar grid colour to also assist the measuring.