Home Science Tools MI-20STERX Instruction Manual - page 4
© Home Training Tools Ltd. 2005
Page 4 of 8
Visit us at
www.homesciencetools.com
Tension Collar
1. Focus the microscope on a small specimen
in the center of the stage plate.
2. Focus your eyes on the specimen.
3. Pull your eyes back from the eyepieces
about 1”. In your peripheral vision you will
see two field view circles overlapping each
other.
4. Open or close the distance between the
eyepieces by twisting them apart or pushing
them together until the two circles merge
together and appear as one circle. The
interpupillary distance is set correctly when
you see just one field view circle.
5. Close your left eye and turn the focus knob
until the specimen is in focus for your right
eye.
6. Close your right eye and bring the specimen
into sharp focus for your left eye by turning
the knurled diopter band on the left
eyepiece. Do not use the focus knob for this
last step – use only the diopter adjustment.
(Note: The diopter must be adjusted for
each person using the microscope.)
Maintenance
Changing the Bulb
If your microscope bulb burns out, follow
these steps to replace it:
1. Obtain the correct 10-watt tungsten
replacement bulb (our item MI-BULB5).
2. Unplug your microscope from the power
supply and allow it to cool before replacing
the bulb.
3. Lay the microscope carefully on its back or
side.
4. Insert a screwdriver
along one end of the
bulb and use it as a
lever to pop the bulb
out of the socket.
5. Pop a new bulb into the
socket.
Adjusting Tension
The focus tension
is pre-adjusted by the
manufacturer, but if it
falls out of adjustment,
the microscope head
will drift down under its
own weight and the
image will move out of focus. The tension
adjustment collar is located between the
microscope arm and the focus knob on the left
side (when the stage is facing you). To adjust
the tension, follow these steps:
1. Insert the small C-wrench into one of the
holes on the collar and turn the collar
clockwise to tighten or counter-clockwise to
loosen.
2. Tighten only enough to keep the stage from
drifting downward.
Specifications
Widefield 10x eyepieces, fully coated
Inclined 45° head with 55-75mm
interpupillary distance and one diopter (+/-
5 diopters)
MI-20STERX has 2x fully coated objective
providing 20x magnification with a field of
view of 10mm; MI-30STERX has 3x
objective for 30x magnification with a field
of view of 6.7 mm. Both have a 75mm
working distance
All metal rack-and-pinion focusing, focus
knob has tension adjustment
Stage with stage clips and reversible
white/black stage plate
Maximum specimen height of 75mm on-
stage and 120mm off-stage
Tungsten 10-watt, 12 volt top light
illumination with grounded 110 volt cord