Write at any angle in food-, pharmaceutical-, and cosmetics-processing plants—these pens contain metal and chemical additives that set off metal detectors and show up on X-rays if they fall into your line. Bright blue in color, they’re easy to find and retrieve. They help you comply with Hazard Analysis and Critical Control Point (HACCP) programs to make sure contaminated food doesn’t leave your plant. They’re also FDA compliant for direct contact with food.

These pens have pressurized ink, so you can write at any angle, even upside down. They also work on wet, greasy, and powdery surfaces, as well as in extremely hot and cold environments.

Containing only trace amounts of chlorides and other halogens, these markers safely write on materials that are prone to stress cracking, such as stainless steel and titanium. Also known as T.E.C. markers, their ink is trace element certified. They meet standards for quality at aerospace manufacturers such as GE and Rolls-Royce, and are also used in the electronics and nuclear energy industries. Each marker is stenciled with the ink’s batch number for traceability. They work best on clean surfaces.