A method for investigation of essentially similar samples for leaks, whereby the samples are introduced to a leak detection device by means of a transport device. A database protocol packet is intercepted, inspected and then processed by an external database security mechanism system to extract a database query. The edge keys may include a hook or locking mechanism coupled with the housing to prevent uprooting of the edge keys. Hybrid maize seed, plant or plant part produced by crossing the variety PH12K7 or a locus conversion of PH12K7 with another maize variety. The controller allows alignment processing of moving the set table to the alignment position and aligning the workpiece and inspection processing of moving the printing unit to the inspection position and performing inspection of the ejection performance to be performed simultaneously.