Reticle A is designed for general laboratory use (5 mm long, with 0.1mm divisions) and reticle B (4/16" long, 1/64" divisions) is most frequently used in textiles or electronics, and where measurement in mils is required. Reticle C (5000 µm long, with 50 µm divisions) is calibrated in microns and helpful for pesticide droplet size measurements or anywhere measurements in microns are required.
Measuring reticle for Macroscope 25, designed for general laboratory use ( 5mm long, with 0.1 mm divisions).