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Backup your keys! Key Gauge from Factory Brands helps you determine the key number from Schlage™ and Kwikset™ keys with your iPhone 4 and iPhone 4S. Using the iPhone's high-resolution Retina Display, Key Gauge will show you actual size images of popular keys. You can dial in the key bitting and the image on your iPhone screen will change to match that of your key. The image shown can also be flipped over to show the back of the key.

After the image on the screen matches that of your key, you can record the key number, any stamping notation that it may have and any notes. The table of key numbers, key stamps and notes can be emailed out of the application as a CSV file at any time.

Use Key Gauge to record your key numbers for your home, office and those keys at the back of your junk drawer.

Keys images currently supported are:

Schlage™ - C 5 Pin, C 6 Pin, C123, E 5 Pin, E 6 Pin
Kwikset™ - #5 and #6

This app is designed for iPhone 4 and iPhone 4s screens.