ZuckOff , a free Bluetooth detection app built by 30-year-old Polish developer Pawel Szydlowski, will tell you whether there is a pair of smart glasses in the room with you. In its launch month, it was reportedly downloaded by over 5,000 people on Apple’s App Store. As of writing, it had been downloaded 1,000 times on the Google Play Store. You bought the hardware. Now you’ll need to subscribe for “expanded access” to the most advanced features. Meta’s smart glasses have had a hefty share of scrutiny over the past few months. Unsolicited filming is a growing public safety concern, with venues like schools and cinemas increasingly banning their usage outright. Szydlowski recorded the Bluetooth signals broadcast by various models of smart glasses, building a digital fingerprint for each of them. He bought the hardware himself to compile the data that flags when a unique identifier matches up with a manufacturer identifier, catching models like Ray-Ban Meta, Oakley Meta and Snap Spectacles in the vicinity.…