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LIMITED LIFETIME WARRANTY 

 
National warrants this microscope to be free from defects in material and workmanship under normal use and 
service for the life of the instrument. This limited lifetime warranty excludes all internal electrical components 
which are only warranted for a period of one year.  The warranty does not cover damage resulting from abuse or 
misuse, repairs or alterations performed by other than authorized repair technicians, or damage occurring in 
transit. The warranty does not cover bulbs, power supplies, rechargers, batteries, fuses, cords, or add-on 
accessories such as mechanical specimen holders that are not built into the microscope stage as an integral 
part of original manufacture. Warranty does not cover lenses that have become inoperable due to excessive 
dirtiness as a result of misuse or lack of normal maintenance.  
 
Any cameras and software supplied with this microscope are warranted from date of purchase as follows:  
 

Camera, 1-year limited warranty:  

Manufacturer warrants camera to be free from defects in material 

and workmanship under normal use and service for 1 year from date of purchase.  It does not cover 
damage resulting from abuse or misuse, repairs or alterations performed by other than the 
manufacturer, or damage occurring in transit. 
 

Software, 90-day limited warranty:

  Manufacturer warrants software to be free from defects in 

material and workmanship under normal use and service for 90 days from date of purchase. 

 
Other than set forth above, National hereby disclaims all warranties, express or implied, of fitness for a particular 
purpose. 
 
While it is not necessary to register your purchase of a microscope, any camera or software must be registered 
by completing and mailing the warranty registration card enclosed with such product.  
 
For warranty service, instrument should be well packed to avoid damage in transit, accompanied by a description 
of the difficulty and return instructions, and shipped postage prepaid to National at the address below. National 
will repair or replace at no charge and return postage prepaid. 

For customers living outside the United States, 

National will provide standard warranty service.  However, inbound & outbound shipping cost is the responsibility 
of the consumer. 

 If failure was caused by misuse, alterations, accident or abnormal conditions of operation, an 

estimate for repairs will be submitted for approval prior to work being performed. 
 
This warranty gives you specific legal rights, and you may also have other rights that vary from state to state. If 
you have questions concerning this product or warranty, contact the dealer from which it was purchased. You 
may also contact National at the following address and ask for warranty assistance. 
 
If you have questions concerning this product or warranty, contact dealer from which it was purchased.  Or 
contact National, asking for warranty assistance. 

 
 
 
 

(Revised 4/21/2010) 

Summary of Contents for 409TBL Binocular Stereo

Page 1: ... Tri County Parkway Schertz Texas 78154 Phone 210 590 9010 Fax 210 590 1104 INSTRUCTIONS FOR STEREOSCOPIC MICROSCOPES 409TBL Binocular Stereo 410TBL Binocular Stereo 411TBL Binocular Stereo Copyright 1 2 01 National Optical Scientific Instruments Inc ...

Page 2: ... Stage plate locking screw Stage plate Fuse Top light incidental illumination Arm Focusing knob tension adjustment collar behind knob on this side Head Diopter adjustment Eyepiece locking screw Main power switch Stage clips Rubber eyepiece shield Slotted head retaining screw located on side Glass objective lens protector ...

Page 3: ...hanging stage plate G Dustcover 2 Examine packing material before you discard it Retain the styrofoam container in case you need to transport store or return the microscope for service If it becomes necessary to ship the microscope for any reason pack it in the styrofoam container and then pack the styrofoam in another corrugated shipping container for optimum protection Use of the styrofoam alone...

Page 4: ...l help to secure them against loss B Install rubber eyepiece shields by slipping over top of eyepieces flared side outward OPERATION 1 ILLUMINATION A Before operating microscope make certain that the main voltage of your microscope corresponds to the voltage of your power outlet either 120v or 220v Insert microscope plug into matching voltage outlet B The microscope is furnished with two stage pla...

Page 5: ...en slide cover slip up on center of stage plate C Turn focusing knobs until object being viewed is in focus D Adjust diopter for difference in eyesight Look into right eyepiece with right eye Turn focusing knobs until sharp image is obtained in right side of microscope Look into left eyepiece with left eye Adjust sharpness of image by turning knurled diopter adjustment located on left eyepiece tub...

Page 6: ...in a small amount of distilled water or Windex to clean all foreign material from glass surface 2 MECHANICAL MAINTENANCE The only mechanical adjustment the microscope might require is the tension of the focusing mechanism This has been adjusted at the factory but over the course of time it may loosen and cause the head of the microscope to slip downward on the focusing block The tension adjustment...

Page 7: ...ower cord not connected Plug into outlet Lamp burned out Replace lamp Fuse blown Replace fuse Image does not remain in focus Head of microscope drops from its own weight Adjust tension control Poor resolution image not sharp Clear glass objective lens protector dirty Clean glass protector Eyepiece lens dirty Clean eyepiece lenses Spots in field of view Eyepiece lens dirty Clean eyepiece lenses Spo...

Page 8: ...o be free from defects in material and workmanship under normal use and service for 90 days from date of purchase Other than set forth above National hereby disclaims all warranties express or implied of fitness for a particular purpose While it is not necessary to register your purchase of a microscope any camera or software must be registered by completing and mailing the warranty registration c...

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