Gerhard Fuernkranz wrote: > do you happen to know, whether the i1 Pro uses adaptive integration time > also in reflective mode? Hi Gerhard, yes it does to a degree. During the calibration it adjusts the integration time to achieve a signal level within a certain target window. If it can't achieve this, the calibration fails. Scan mode is different though, as it sets a the integration time to give a maximum sample rate. The effective integration time in for a scan will depend on the patch length and the sweep speed (ie. the number of sample values averaged). Graeme.