For Sale: National Model 161 Dual Viewing Compound Microscope

National Model 161 Dual Viewing Compound Microscope:
OPTICAL SYSTEM:
Widefield 10x /18mm eyepiece, pointer standard in one eyepiece.
Accepts optional #965-160 eyepiece reticle.
Dual viewing head with 30° inclined eyepiece, and vertical eyepiece with diopter, rotates 360° for easy sharing by more than one student.
Permits dual viewing, or mounting of optional video adaptor on vertical tube.
OBJECTIVES:
DIN standard:
4x (0.10 N.A.)
10x (0.25 N.A.)
40xR (0.65 N.A.)
100xR oil immersion (1.25 N.A.)
Quad objective turret is ball-bearing mounted
Mounted in reverse position to facilitate ease in changing slides.
ILLUMINATION:
12v 20 watt halogen with variable rheostat control.
Illuminated on/off switch, 3-wire grounded cord and plug.
FOCUSING:
Coaxial coarse and fine focusing controls, coarse has tension adjustment, fine is graduated.
STAGE:
Large 140mm x 135mm (5-1.2 in. x 5-1/4 in.) stage; built-in, low profile, ball-bearing mounted mechanical specimen holder
with low-position coaxial controls, 70mm (x) by 50mm (y) movement with graduations of 0.1mm.
1.25 N.A. Abbe condenser has rack & pinion focusing, iris diaphragm, swing-out filter holder
with clear blue, green and yellow filters supplied.
Lifetime limited warranty, excluding bulb, cord, and fuse.