Abstract: The present invention provides inexpensive pipettes and related structures offering high precision while minimizing the effects of operator error and chances of cross-contamination. In one embodiment, a pipette comprises a suction apparatus and a hollow body comprising a sample collection chamber, the sample collection chamber open at a first end and closed by a porous barrier material intermediate to or at a second end opposite the first end, wherein the suction apparatus is coupled to the hollow body.

Abstract: Various embodiments of devices and methods for indicating the level or amount of a vaporizable material in a dispenser, such as an air freshener device or insect control system, are disclosed. An embodiment of a dispenser includes a housing with a reservoir and wick that may be removably coupled to the housing. A circuit within the dispenser measures a property in the wick, such as an electrical property, or a level of vaporizable material in the reservoir and triggers an indicator that provides a visual or audible signal to the user advising that the reservoir is low or empty.

Abstract: A filter is provided within a transparent drinking straw. The filter has a dense core region and a less dense outer peripherial region. The filter is retained in place within the straw by frictional forces under static conditions. The frictional forces which maintain the filter in place under static conditions may be overcome by fluid flowing through the straw causing the filter to move within the conduit. The filter may support particulate matter which may be a medication or drug. Accordingly, the device may be used as delivery device for drugs administered by oral ingestion. Movement of the filter from a first to a second position provides a visual indication that a predetemined volume of fluid has passed through the conduit.