Toxin detector/Legends

A toxin detector was a small handheld device that could scan food and drink to determine if it was spoiled or poisoned. It could provide a visual indication via a blinking green light if the item scanned was safe for consumption. It could also be set to vibrate when a poison was detected. A more expensive model was concealed in a bracelet or other piece of jewelry for maximum concealability.

Source
Galaxy of Intrigue