Donegan Optical Company Inc
Clip-On Binocular Magnifier

2x, 10" Focal Length
Walthers Part # 240-504, p. 856 Walthers 2012 HO Scale Reference
A scale, $32.29, currently in stock at Walthers

 
Hands free magnification for detailed tasks. Lightweight frame can be used with frame included, or easily clipped onto most eyeglass frames. Pivots up when magnification if not needed. Relieves eye strain and increases accuracy.