Meta description  character limit ?

Meta Description character limit is 156 words. However now a days it's fixed width. You can use this tool to check your meta description width http://www.seomofo.com/snippet-optimizer.html

Meta Description character limit is 156 words.

Latest Google updated Meta description character limit.
Google: 156 Characters (Including Spaces)
Yahoo: 161 Characters (Including Spaces)
Bing: 150 Characters (Including Spaces)

Meta descriptions can technically be any length, but Google generally truncates snippets to ~155–160 characters. It's best to keep meta descriptions long enough that they're sufficiently descriptive, so we recommend descriptions between 50 and 160 characters.