Do you need an easy method to verify your vibration inputs on your Cobra II and Viper II are working properly? Click here for a quick and economical step-by-step procedure. You can also purchase a 440Hz tuning fork that can be shipped to you directly by clicking here.
SPECIAL OFFER: all purchases of the 440Hz Tuning Fork come with FREE shipping (Continental US only) and your choice of a FREE Cobra II or Viper II hat!