this is AWESOME!

on 20 cm 2 mm to long!

perfect here! 19"

way too big on 13"

it's 7 mm longer on my 15"

perfect on a 24"

5mm under 25 cm on my 26 inch

0.5mm to short on my 22"

perfect

It's perfect on my 13.3" Macbook.

Perfect on 23"

I guess its right but I have no way to tell

2mm to small on 21" crt

DIRECTIONS!!

you have to enter the actual viewable portion of your monitor not the whole size.

Example:
I have a 21" crt but there is a Black box on the outside of where my screen starts to work. it just happens to be .5 inch on both sides so
21 minus 1 =20 inch monitor size.

perfect on my 15"

How do you know if its wrong? why would you look up an online ruler if you had a way to measure it?

I Agree With Robby, It Kinda Makes This Website Obsolete! You Guys Just Put Yourself Out Of Jobs, Way To Go...!

i dont like it your the worst person ever i hate you

perfect on a 22"

Perfect on 19" 1440x900

I can't see it

hard to see

fake-doesn't wrk fr me

it is so big i had too get another ruler too measure it

I have no idea what to do?????

omg i'm so excited for my gems to come in the mail

Assuming 8.5in wide paper is exactly that, came out 1mm over, so pretty accurate. 14.1in laptop display.

this is great... helped me finish organic chem lab

How long did you say a bed bug is? ... oh, crap. It got away!!!

22" is perfect i think

about perfect on my 15.4" laptop screen, on google chrome

Juuust about perfect on my 17", only a mere 0.9 of a cm larger than it should be but I certainly find it accurate.

works perfect on my 15 in laptop but the scroll bar gets in the way so when i move it over a tad bit i know its on 15 or hell of alt close

This changes in respect to your browser sometimes, because browser can display at different sizes

1mm long on 19"

IMMMMMMMM MADDDDDDD.
im trying to use this for my homework but ...
do you have any different type of cm rulers because this one only has 10ths!
I needd 12thss!
PLEASE.

this works!! 18'' safari!!