The companies under the Tensor umbrella offer a complete range of biometric smart card, visitor monitoring, CCTV, barrier and access control technologies as ways to deter or prevent intruders gaining access to your site. It is a tough job thwarting determined thieves, as shown when a group stole three lorries from a Welsh haulage firm. The intruders broke into the office and took the keys which have the vehicle registrations on. The gang had tried to steal a fourth Mercedes lorry from the company's Flintshire yard, but after starting it and putting the lights on they could not work the elaborate gearbox and left it with the motor running.