ipaq 4L. I call it my Star Trek module. The universal translator. It can take any signal and convert it to any other signal. It's programmable with a cable and free software. The cable costs 100. I use it to read my 0-3v signal from a Carrier IGV motor and output 4-20 to a hot gas on Retropics. Optically isolated. Action reversible. Available from Instrumart.com