I4P-POL7-7777, Simple Polarizer Attachment for i4 Infinity LabScope Only looking at crystals in urine or other fluids? The Simple Polarizing Kit for I4 microscope includes only the upper Analyzer and lower Polarizer for urinalysis and other routine polarization applications. This low-cost Simple Polarizing Kit does not include the First Order Red Compensator Lens and is not suited for rheumatology applications.