Generally, an insect monitor which delivers an insect attractant in the form of one or more gases proximate an enclosure in concentration effective to attract insects to an insect trap within the enclosure to monitor an area for insects. The liquid reservoir further includes detection means for detecting the position of the liquid meniscus andor the channel so as to obtain, from the position of the liquid meniscus, the level andor a change in the level of the liquid reservoir. Since the lens barrel as a driven member is magnetically coupled to the rod which is adapted to move by the piezoelectric actuator, it is possible to easily assure the tilting performance of lens while securing and maintaining a preload. In response to a click of the Print Execute button, on the other hand, the mini-laboratory computer starts time counting and waits until a preset time period in the time processing program elapses.