It’s not a plugin but you may want to check this out.
http://wplondon.com/tutorials/limit-characters-post-title.html
If you want to change the max number of charactors,
you can go to Appearance > Editor and update it.
geeksfolder. Thank you for your attention.
I use this option to limit the amount of characters in the loop.
But I would like to see the character count, and its limitation when editing the post in the Admin.
You will have to write functions and add actions.
Refer to this page to see how to add the settings page menu.
http://codex.wordpress.org/Adding_Administration_Menus
And create a form to add the value of charactors.
When you submit the form, update the option value.
Refer to this.
http://codex.wordpress.org/Writing_a_Plugin
Once you update the value, you can call it using
get_option($option);
and use this value to limit the number of the title charactors.
