one and preferably four the brackets 13 are attached to the main body 4 with fasteners through the support cup or disk 7 and the closeout plate 8 the length of the odometer arms 11 are determined by the distance required to extend aft of the support cup or disk 7 the odometer arms 11 are constructed from non metallic materials having good transverse spring properties within the limitations of chemical compatibility with pipeline media the bracket 13 is constructed from various lightweight metallic materials chemically compatible with the pipeline media still referring to fig3 there is shown a circular disc 12 made of various metallic and or non metallic compounds located at the unrestricted end of each distance or odometer arm 11 the circular disc 12 is attached with and rotates on a fastener along its center axis and through a bracket 23 the circular disc 12 uses a series of magnets 24 embedded into the side of the circular disc 12 to trigger a sensor 19 inside the bracket 23 as a means to collect traveled distance during the inspection period still referring to fig3 there is shown an electronics package 14 located inside the main body 4 that confines the data recorder 15 data processor 16 and the power supply 26 excluding sensor 18 and sensor 19 the power supply 26 provides dc voltage to all electronics on the in line inspection device 1 physical transmission from the sensors 18 and sensors 19 to the electronics package 14 is through two wire bulkhead assemblies 25 the tool configuration shown in fig1 3 is that of a unitary body or u201c single section u201d tool in other words the in line inspection device preferably does not comprise a flexible joint to provide for flexing.