We study the tachyon and the RR field sourced by the (m,n) ZZ D-branes in type 0 theories using three methods. We first use the mini-superspace approximation of the closed string wave functions of the tachyon and the RR scalar to probe these fields. These wave functions are then extended beyond the mini-superspace approximation using mild assumptions which are motivated by the properties of the corresponding wave functions in the mini-superspace limit. These are then used to probe the tachyon and the RR field sourced. Finally we study the space time fields sourced by the (m,n) ZZ D-branes using the FZZT brane as a probe. In all the three methods we find that the tension of the (m,n) ZZ brane is mn times the tension of the (1,1) ZZ brane. The RR charge of these branes is non-zero only for the case of both m and n odd, in which case it is identical to the charge of the (1,1) brane. As a consistency check we also verify that the space time fields sourced by the branes satisfy the corresponding equations of motion.