Deep Freezer Temperature Monitor?

Looking to see what others would recommend to monitor the temperature in a deep freezer? I would like to setup an alarm in the Vera to notify me if the temperature drops below a certain temperature if the freezer ever got unplugged or a circuit breaker was tripped on accident. Thank You

http://forum.micasaverde.com/index.php/topic,10461.msg72265/topicseen.html#msg72265