Disclosed herein is an industrial preparation of Quetiapine by the reaction of 11-piperazinyldibenzob,f1,4-thiazepine or its salt with 2-ethanol in presence of an organic or inorganic base under neat or aqueous condition to form 11-4-{2-ethyl}-1-piperazinyldibenzob,f-1,4thiazepine. The measuring container has a measuring chamber for receiving a sample material. To make the maintained values available even after a brief period during which the GPS receiver is powered down, the maintained values can be stored in a non-volatile memory.