The ZWO 5-Position Manual Color Filter Wheel - 1.25-inchhas five positions, and as you can see from the photographs, the current position is marked clearly on the wheel itself. Simply rotate the wheel into the position you prefer.
You'll need a set of 1.25-inch filters for this filter wheel. The package comes with adapters for both the camera and the telescope side.
ZWO Filter Wheels only take ZWO Filters, Baader Filters, and Astrodon Filters.
OPT Product Number: ZWO-FW