Etched vertical line used to anchor calipers is centered in a contrasting darkened band, making visualization easier

·         Scale is permanent brown stain

·         Marked “Sealed 3” for use in states requiring this special marking

·         Designed for use in APHA 15.8 or AOAC 920.111 test procedures

·         Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements