Well, I have the DATAMAN S4 I love it .. Portable, NiCd powered, and can run hooked to a computer thru a serial port.. I take my HP200LX along and can modify chips for Bosch Motronic in the field.. It's a bit pricey at $800, but IMHO worth every penny Jim Conforti 1994 BMW 325i 1995 BMW M3