Described is a method for analysing at least one sample in an array of samples, the method including recording an image of the position of at least one sample relative to the other samples; utilising the recorded image to allow the application of a reagent or a succession of reagents to at least one sample in situ; and analysing at least one sample for a reaction with the reagent. Some embodiments may include a tamper resistant storage element that stores information regarding one or more operating points of an adjustable processor operating parameter. The developer carrying member extends from the first side wall to the second side wall in a width direction perpendicular to the length direction.