signal evaluation circuit 40 are also connected to each other via a bonding wire 54 so that the sample signal 39 can be transmitted between measuring sensor 35 and the signal evaluation circuit 40 via the fitting island 48 and the bonding wire 54 in the present embodiment the fitting island 48 is connected directly to one of the two contact terminals 52 while the other of the two contact terminals 52 is isolated electrically from the fitting island 48 and is connected to the signal evaluation circuit 40 via a further bonding wire 54 in this way the data signal 42 can be output from the signal evaluation circuit 40 via the two contact terminals 56 in the context of the present embodiment the holding frame 46 has two transport strips 58 which run in parallel with respect to each other and are connected to each other via connecting webs 60 formed on the transport strips 58 are transport holes 62 in which a transport tool not specifically illustrated can engage and move the leadframe 44 also formed on the transport strips 58 is an index hole 64 by means of which the position of the leadframe 44 can be determined and therefore controlled during transport to protect the reading head 28 a housing can be formed around the fitting island 48 carrying the reading head 28 and a part of the contact terminals 52 the housing can for example be formed as a protective compound around the reading head 28 for which purpose for brevity reference is made.