The Supertech® 100mm Radiopaque Acrylic NIST certified ruler is lead-free is safe for skin contact. These radiopaque rulers are calibrated and traceable to a National Institute of Standards Technology standard in Washington, DC. Each ruler is given a unique serial number and a calibration certificate.
Acrylic radiopaque ruler is 1.5mm thick x 30mm wide with 1mm graduations, and lead-free.
Supertech recommends cleaning radiopaque acrylic rulers with soap and water, to sterilize use ETO when needed. Do not use harsh chemicals, do not autoclave or steam clean.