The first thing to do after download: Calibration!!!
At first the ruler is set for 10.1 inch tablet by default.
You need to click MENU/Calibration...adjust the screen to match the markings with a real ruler. You need only do once.
iRuler: mm / inch (for both phone and Pad up to 10.1 inch)
There are mainly 6 pages namely Ruler, Calculator, mm Grid, inch Grid, Protractor and Shapes.
auto - Protractor measure angle by rotating phone.
You can use the Grid page to check the quality of your phone's LCD. if grid aligns regularly, good LCD.
Before use, Please do Calibration with a real ruler.
For Ruler page, set scale factor (+ve/enlarge or -ve/shrink) for mm and inch individually.
For Grids pages, set x,y scaling factors for both mm and inch individually.
Can measure distance longer than the ruler, just click on the "plus" label, it will auto add up the ruler's whole length. (accumulate)
Total Length/Total distance=(n x RulerLength) + the final reading.
For example your device's screen is 65mm.
And your measure your table to be 12 times of your device length with the final reading of 28mm.
Then the total length of your table is 12X65+28
The app will guide you to get the total length.
