Image processing methods and systems for noise reduction and edge enhancement. The mirror unit may have a rotatable attachment that can rotate along the attached face of the sun visor body. The system also includes a drop tube configured to receive the agricultural product, and to convey the agricultural product at a drop tube angle to the agricultural product inlet. A system may optionally have a sample chamber portion having a chemical indicator element which may be removably connected. This aspect guarantees a minimum time interval between each individual actuation event.