Made with metal and chemical additives, these calculators trigger metal detectors and X-rays if they fall into your food line, helping you comply with Hazard Analysis and Critical Control Point (HACCP) programs for food safety. Their bright blue case makes them easy to spot and retrieve. Because their case is sealed, they have few gaps where germs could grow, reducing the chance of illness. They’re also safe to touch food, since they’re FDA compliant.

These calculators are solar powered, but they come with backup batteries for dim areas. The lanyard breaks away at the clasp if it’s caught, so you can quickly remove it in an emergency.