The steel drill string attached to a drilling bit during typical rotary drilling operations used to drill oil and gas wells is used for a second purpose as the casing that is cemented in place during typical oil and gas well completions. Further, the light-amount control device includes a peripheral light amount data calculator and a lighting unit controller. In some implementations, trust may be established andor enhanced due to one or more security features being collocated with the sensor at the actual sampling site. In this case, the flow is restricted for the vapor injection mode of operation to a desired level. An engagement assembly 8 is positioned intermediate the drive gear and the handle assembly for winding the strand onto or off of the drum by the handle assembly when the strand is under tension and disengaging the handle assembly from the drive gear when tension on the strand is released to allow the drum to rotate while the handle assembly is stationary. A venting layer can be disposed between the assay input layer and the output layer.