Thermohygrometer testo 623,history func., f. measur. valuesThermohygrometer testo 623,history func., f. measur. values, 0 100% rF, 10 +60C With history function. The large display shows the current and past temperature and humidity values as well as the date and time Selection option for temperature or humidity histogram Bar graph display of measured values over the last hour (for 5 min measuring cycle), 2 hours (for 10 min measuring cycle), 12 hours (for 1 h measuring cycle), 24 hours (for 2 h measuring