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The GSM Cable Lock can be used to guard table saws and other stationary tools left on the job site. It has a rugged plastic body and a steel cable; if an unauthorized person cuts or removes the cable, the alarm sends a text message to as many as four cell phones. The lock costs $200 with a 10-foot cable, $220 with a 20-foot cable. It works with an AT&T or T-Mobile network for a monthly charge of about $10.

Nu-Set, 800/606-8738, nuset.com.