This one's great for anyone living in an earthquake-vulnerable location. Having personally experienced several earthquakes, the Home Richter Scale holds mass appeal, as I assume it would for many others living on the West Coast. The little device is affordable at $85 and although it won't be able to predict tremors, it will rate those that have passed. "It will measure the intensity of one in real-time while sounding an alert for those people who don't realize the earth is shaking beneath their feet," Oh Gizmo! reports. "Once the tremor has passed the GraGraph will announce the strength of the event and will also make suggestions on what you should do in the event the quake was particularly violent."