Downhole measurement tool assembly for measuring and storing at least one quantity in a wellbore and for wireless surface read-out

A downhole measurement tool system comprising:

• a downhole measurement tool assembly for measuring at least one quantity in a wellbore, the downhole measurement tool assembly comprising:
• a pressure housing;
• at least one sensor mounted in the downhole measurement tool assembly for measuring the at least one quantity in the wellbore,
• wherein the downhole measurement tool assembly further comprises:
• a memory coupled to the at least one sensor for storing values of the at least one quantity to obtain stored measurement data for later read-out;
• an antenna that is dedicated to and configured for allowing wireless communication of the stored measurement data between the downhole measurement tool assembly and an external read-out system while both the external read-out system and the downhole measurement tool assembly reside at the Earth's surface out of the wellbore, wherein the antenna is mounted at an external side of the pressure housing such that it is exposed to direct pressure in the wellbore when residing in the wellbore;
• a transceiver being located in the pressure housing and being coupled to the antenna for controlling the communication via the antenna;
• and
• a pressure connector provided in an external sidewall of the pressure housing, wherein the antenna is coupled to an internal transceiver via the pressure connector;
• the external read-out system, wherein the external read-out system comprises a further antenna and a further transceiver coupled to the further antenna for controlling the communication via the further antenna.