User Manual

5
distance between the objective and the object to avoid their contact.
CAUTION: The objective should not touch the specimen, otherwise the objective or/and the specimen might be
damaged.
• Look through the installed eyepiece and lower the stage slowly rotating the focusing knob until you see the
specimen image.
• Such adjustment protects the frontal lens from contacting the object when you use objectives of other
magnications; though, slight refocusing might be required.
• If the image is too bright, rotate the diaphragm disk until the passing light ray is reduced to a comfortable
brightness level. If the image is too dark, select a larger aperture to increase the light ray.
Selecting the objective
Start your observations with the lowest magnication objective and select a specimen segment for detailed research.
Then move the specimen to center the selected segment in the eld of view, to make sure it keeps centered when
the objective is changed to a more powerful one. Once the segment is selected, you should center its image in the
microscope’s eld of view as precisely as possible. Otherwise, the desired segment might fail to center in the eld of
view of the higher power objective. Now you can switch to a more powerful objective by rotating the revolving nosepiece.
Adjust the image focus if required.
Specications
Type biological
Magnication 40–640x
Head monocular, inclined 45°
Optics material optical plastic
Body material plastic
Eyepiece tube diameter 30mm
Eyepieces WF10x–16x
Revolving nosepiece 3 objectives
Objectives 4х, 10х, 40х
Stage diameter 82mm, with specimen holders
Stage moving range 0–15mm, vertical
Focusing coarse
Diaphragm disk yes
Illumination lower LED illumination with adjustable brightness
Power source 2*АА batteries
Levenhuk K50 experiment kit yes
Levenhuk reserves the right to modify or discontinue any product without prior notice.
Note:
The Levenhuk K50 experiment kit is supplied without an individual plastic case.
Care and maintenance
Never, under any circumstances, look directly at the Sun, another bright source of light or at a laser through
this device, as this may cause PERMANENT RETINAL DAMAGE and may lead to BLINDNESS. Take necessary
precautions when using the device with children or others who have not read or who do not fully understand these
instructions. Aer unpacking your microscope and before using it for the rst time check for integrity and durability of
every component and connection. Do not try to disassemble the device on your own for any reason. For repairs and
cleaning of any kind, please contact your local specialized service center. Protect the device from sudden impact and
excessive mechanical force. Do not apply excessive pressure when adjusting focus. Do not overtighten the locking
screws. Do not touch the optical surfaces with your ngers. To clean the device exterior, use only special cleaning
wipes and special optics cleaning tools from Levenhuk. Do not use any corrosive or acetone-based uids to clean
the optics. Abrasive particles, such as sand, should not be wiped o lenses, but instead blown o or brushed away
with a so brush. Do not use the device for lengthy periods of time, or leave it unattended in direct sunlight. Keep the
device away from water and high humidity. Be careful during your observations, always replace the dust cover aer
you are nished with observations to protect the device from dust and stains. If you are not using your microscope for
extended periods of time, store the objective lenses and eyepieces separately from the microscope. Store the device
in a dry, cool place away from hazardous acids and other chemicals, away from heaters, open re and other sources
of high temperatures. When using the microscope, try not to use it near ammable materials or substances (benzene,
paper, cardboard, plastic, etc.), as the base may heat up during use, and might become a re hazard. Always unplug
the microscope from a power source before opening the base or changing the illumination lamp. Regardless of the
lamp type (halogen or incandescent), give it some time to cool down before trying to change it, and always change it