Password Strength Meter

Almost every web site provides password strength meter.
To make a strong password it should contain:

• Sufficient length
• Mixed case
• Combination of numbers and Special characters

My password strength meter works on same line:

If password is of minimum length and same case it is a weak passwd

If password is min length mixed case and number normal passwd

if password is min length mixed case number and special char it is medium password

if password is above min length and combination of number and special char, it is strong passwd