Coddington Loupe 10x - 23mm diameter - metal case foldout type.
A Coddington lens combines two lens elements into a single thick element, with a groove cut in the center of the element to select the portion of the imaging light with the lowest aberrations. The working distance tends to be very short.
Forensics Lab Supply Number 3540307.
Formerly Grau-Hall Corporation dba Grau-Hall Scientific.
Optical Microscoy Primer