Model M110AE reads to 0.0001mm at 25X  magnification with a 4mm range and 66mm working distance. Model M115AE reads to 0.00001 inches at 50X  with a 0.08" range on object and 1.5" working distance. Other calibrations and magnifications are available. All models are equipped with the M202E electronic micrometer.

electronic eyepiece micrometer M202E description
The M202E consists of an adjustable 10X  widefield eyepiece micrometer with rotary encoder, a programmable digital display and power supply.  It can be added to most microscopes to provide fast, convenient and precise measurements.  The rotary encoder gives 2000 counts per revolution using a high precision 1 mm pitch screw.  The range of crosshair travel of 10 revolutions covers 10mm across the eyepiece field of view. Range on the object will be limited by the initial magnification or field of view of the objective.  The compact digital display has 6 digits and is user programmable so virtually any scope magnification can be calibrated.

The M202E electronic eyepiece micrometer is shown below mounted in our M101A microscope with a 38 mm M222 objective, 3.2X initial magnification, 45 mm working distance and 3.4 mm object field. This 32X scope  can be calibrated to read 0.0001 mm or 0.00001in per division resolution.

Different objective magnifications will affect the accuracy of measurement.  The precision of the reading will generally be greater with an objective of higher magnification because the object will appear to be larger thus requiring more travel or turns of the micrometer screw across the object. At other times it is easier to measure with less magnification because the measurement beginning and end points are easier to recognize and appear sharper and  so actual experience with the measurement is the best guide.

The following objectives are optionally available for the M101A (160mm tube length, all dimensions in mm):

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