Jim, the 1.5 msps is only in the 4 channel mode. It is rated at 6 msps on one channel , and 3 msps on 2 channels. I went to the vetronix web site, and the new mt5100 is rated at 1.5msps in 4 channel mode, and 6 in single channel mode just as the modis. They bo... Login to read more.