Abstract: A test system and a method for producing a test signal for food tolerance analysis using a signal producing device (12), from which an electric signal may be produced at a defined frequency spectrum and may be electrically coupled with a sample (18) containing at least one sample substance, and with an output (23), via which the signal generated by the signal producing device (12) may be emitted when coupled electrically with the sample (18). The test system and method enable food tolerance analysis to be performed easily, safely and quickly.

Abstract: A data recorder constructed in the form of a hand set (10) with an actuating mechanism function switch (14) and a time switch clock coupled to an audible signal transmitter with a time setting means, the reset key or the reset function is inhibited until after the data recall, in which each data recording is storable with a presettable time at which the audible signal transmitter is activated by means of a timing circuit, and/or wherein the data recording is individually inhibited until its recall againt an inadvertent reset so that the recorder can be employed as an appointment scheduler.