The embodiments of the present invention aim to integrate two common agricultural-practices, first of hothouses cover application, and second of protective netting. Trimming logic values are produced in response to a clock signal that is applied to the device in a trimming mode. The apparatus also includes a drain conduit leading from the nozzle assembly to a waste collection. The band-shaped protrusion 7 is provided with a fitting hole 8, and each fuel injection valve 2 is provided with a protrusion 9 fitted into the fitting hole 8. For example, the parameters may weight the conditions and may include ranking the conditions, determining whether the conditions are mandatory for the pool, and determining a percentage deviation for numerical ranges. The optic scanning portion scans light incident from the optic combining portion on a screen.