What can anyone tell me about the Calculator Based Ranger (from TI). It appears to be a velocity sensor that automatically downloads programs to calculators, can link to the CBL, and does velocity plots for "under $100" Can I build my own? What is the street price? Does it work good? It would seem pretty easy to build one because it works with all TI's in BASIC (i think). -Larry C Larry1492@juno.com