Technically, what [Alex] built is better called a “seismic detector” since it’s not calibrated in any way. It’s just a simple sensor for detecting ground vibrations, whether they be due to ...

The first known earthquake detector was invented in 132 A.D. by the Chinese astronomer ... a drum with paper on it, a bar or spring with a hinge at one or both ends, a weight, and a pen. One end of ...

The GM730 seismic detector offers an outstanding price/performance ratio with advanced functionality for the use in safes, ATMs, ticket machines, night deposit boxes, vaults and strongrooms. It is ...

It is offered complete with interconnection lead, which can be used to program Senstec® seismic detectors beforehand or directly on site. SensTool provides visual imaging of structure-borne sounds ...