Model 131 | National Optical

Compound Microscopes

131

Suggested Retail Price

$ 217.00

Similar Models Available:

Model 131-MS With mechanical stage	$ 257.00

Microscope Diagram

Model 131

The microscope model that sets the standard for high school instruction. Includes all the most commonly specified features. Rugged metal construction, locked-on parts. Superior DIN optical system and precision mechanical components assure parfocalled and parcentered optical alignment for sharp, unsurpassed viewing. Recommended for instruction through grade 12.

OPTICAL SYSTEM

Widefield 10x eyepiece with revolving pointer. Accepts optional #965-160 eyepiece reticle.
45° inclined viewing head rotates 360° for easy repositioning of eyepiece and sharing by more than one student.
DIN 4x, 10x and 40xR objectives are achromatic, parfocalled, parcentered, color coded.
3-hole nosepiece is ball-bearing mounted for more precise alignment, has positive click stops.

ILLUMINATION

115v 20 watt tungsten illumination, condenser and blue filter, base-mounted on/off switch, heavy duty 3-wire cord. Convenient “grabber” clip on plug lets you wrap the cord around microscope and secure in place by pushing cord into clip for easy storage. No bulky cord hanger needed.

FOCUSING

Low position coarse and fine focusing controls.
Stage moves up or down, eyepiece and body remain fixed.
Slip clutch prevents damage to focusing system.
Tension adjustment eliminates stage drift.
Safety rack stop prevents damage to slides and objective lenses.

STAGE

Large 110mm x 120mm (4-3/8 in. x 4-3/4 in.) stage, with locked-on, spring mounted stage slips, drilled and tapped to accept optional mechanical stage (Model 131-MS).
Built-in 0.65NA condenser lens.
Calibrated 5-hole disc diaphragm.

FRAME

Rugged cast metal, gray enamel finish.
Base dimensions: 133mm x 175mm (5-1/4 in. x 7 in.)
Height 360mm (14-1/8 in.) Net wt. 3.1 kgs (6.8 lbs)

PACKING

Molded styrofoam container with instruction brochure and vinyl dustcover.
Individual: Ship wt. 4.5 kgs (10 lbs), Dimensions 550x325x325mm (22x13x13 in.)
Master carton pack 5 each: Ship wt. 19.5 kgs (43 lbs), Dimensions 875x300x450mm (35x12x18 in.)

WARRANTY

Lifetime limited warranty, excluding bulb, cord, and accessory mechanical stage.

Available Parts & Accessories

610-045	WF10x eyepiece w/pointer
610-045R	WF10x eyepiece w/reticle, 10mm/100 div.
615-045	WF15x eyepiece w/pointer
704-045	DIN 4x objective 0.10 N.A.
710-045	DIN 10x objective 0.25 N.A.
740-045	DIN 40xR objective 0.65 N.A.
760-045	DIN 60xR objective lens, N.A. 0.90
799-045	DIN 100xR objective 1.25 N.A.
800-102	Replacement bulb, 115v 20 watt tungsten, D.C. medium bayonet base
800-102-220	Replacement bulb, 220v 20 watt tungsten, D.C. medium bayonet base
800-138	Replacement bulb, 5 watt fluorescent, for Model 138/139 series microscopes can be used in 110v or 230v version of this series.
801-025	Replacement fuse 0.25 amp, for 131 220v only
910	Graduated mechanical stage, top mounted adjustment knobs
920	Abbe condenser, N.A. 1.25, spiral type, with iris diaphragm
925	Iris diaphragm
930-023	Video adaptor tube, 23.3mm O.D. (fits inside standard compound microscope eyepiece tube, for use without eyepiece.
930-028	Video adaptor, over-the-eyepiece type, includes adaptor rings to fit both 28mm O.D. compound and up to 34mm O.D. stereo eyepieces
935	Pointer for compound microscopes, spring type
951	Dustcover, 16" tall x 13", heavy vinyl with stitched seams
965-160	Eyepiece reticle, 10mm/100 Div., 19mm diameter, 1.28mm thick
970-131	Stage clip, spring activated, supplied with M3 x 0.5x x14 mounting screw. Each
975-001	Carrying case, anodized aluminum, fabric lining, accessory pockets, Velcro straps, keyed lock. Interior dimensions: 14-7/8 x 7-3/4 x 10-1/2 inches. Fits all of above, except dual head models.
975-002	Carrying case, anodized aluminum, fabric lining, accessory pockets, Velcro straps, keyed lock. Interior dimensions: 17-1/4 x 8 x 11-3/4 inches. Fits dual head models.
975-138	Carrying case,heavy plastic w\foam liner.Fits all above, except dual head models.