This study introduces the maximum diameter (D_max) of precipitation particles measured by a two-dimensional video disdrometer (2DVD) as a novel parameter. D_max is applied in a cloud seeding study during the Cloudlab campaign and, for the first time, in a MOSAiC (Multidisciplinary drifting Observatory for the Study of Arctic Climate) case to evaluate the LIRAS (LIdar RAdar Synergy )-ice remote-sensing retrieval of in-cloud ice crystal size and number. Both quantities agreed well with the 2DVD measurements under ideal conditions, highlighting the potential of D_max for precipitation studies.