9 and wsu 39 s 1 installed similar reference numerals are used for similar features as in fig1 to 4 on the inside and operated on the same cable 97 are shown two seu 39 s 9 which have associated wsu 39 s 1 at corresponding elevations externally of the wellbore in the figure both wsu 39 s 1 are facing the formation but it would be possible to have both facing inwards or have one facing inwards and one facing the formation fig8 is the corresponding schematic block diagram showing the multiple sensors on the multiple wsu 39 s 1 associated with the multiple seu 39 s 9 all operated off the one cable 97 referring to fig8 the sensors are depicted measuring open hole properties for example pressure using sensors 29 and temperature using sensors 30 although the foregoing description of the present invention has been shown and described with reference to particular embodiments and applications thereof it has been presented for purposes of illustration and description and is not intended to be exhaustive or to limit the invention to the particular embodiments and applications disclosed it will be apparent to those having ordinary skill in the art that a number of changes modifications variations or alterations to the invention as described herein may.