How to measure TPI (threads per inch) with "Millimeter -screen ruler" App

In this video you can see how to use Millimeter Android app for TPI measurements.

Android: https://goo.gl/YGr70M
iOS: https://goo.gl/0fMmPV

Millimeter is a simple and easy to use app for small object measurements on mobile device screen. There are no ads in the app for best experience and real full screen measurements.
Any device can be calibrated for accurate measurements in Calibration Mode, where common standard objects like coins, credit cards, etc can be used as a reference.

You can also customize your app by purchasing extra features or modes.

What you can do in free version of the app:
Calibrate Millimeter with custom or standard objects
Measure in metric and imperial units: mm and inch
Use fractions for inch units
Change background to BW night mode for power saving and better visualization
Read interactive Help / Guide about all available features in the app
Use app as standard ruler
Use full screen mode for better user experience in ruler mode

You can customize your free version and purchase the following extra modules and features:
Additional vertical ruler for 2D measurements (!)
Area measurement for 2D measurements
Calculate W/H ratio of the rectangular objects in 2D
Parts Mode to split length or objects in equal parts
Thread per inch ( TPI ) measurement pattern (!) in Parts mode
Circle Mode to measure circular objects
Split circle into equal sector / angle
Lock / Unlock rulers in any mode for better usability (!)
Set exact size, length, diameter, number of parts manually with keyboard input (!)


Use this screen ruler in different areas to measure small objects that fit your phone or tablet screen : jewelry, jewels, rings, stones, screws, bolts, buttons diameter, nuts, knitting needles, knitting pattern, washers, insects, mosaic tile, hooks, thread, etc.


More about app:
http://goo.gl/304nJB

Music
http://www.bensound.com/royalty-free-...