In a semiconductor chip, a body has a top surface where a pattern is formed, an underside surface opposing the top surface and a plurality of side surfaces. The strap is connected to a lock housing, wherein a distal end of the strap is configured to pass into a lock passage of the lock housing to form a loop. The tube may also include a sealing member adapted to mate with the wellbore to form a sealing engagement. The thread engaging portion advantageously has a plurality of inwardly extending raised flutes that are circumferentially spaced irregularly about the thread engaging portion. A magnetic resonance measuring unit determines the quantitative property of the sample substance contained in the probe head. And an electronic paper of the invention has a configuration for color display that the display sheet is made up by laminating respective display sheets for red, green and blue colors.