The Supertech® Radiopaque Acrylic NIST certified rulers are lead-free and made in five lengths. These radiopaque rulers are certified and traceable to a National Institute of Standards Technology standard in Washington, DC. Each ruler is given a unique serial number and comes with a certification document.
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.