Hi all, I'm a masters student in psychology, have have a general grip on VB.net but I need to measure my participants' reaction time to high precision (i.e. accurate to the ms) and I need a bit of help. :confused: I've had it suggested that I use a timer control and make it count, but I'd much prefer to access the system clock more directly if possible. I'm currently using the vbtimer, and I also previously had it working with timegettime. Some general advice about the most precise way to do this, and what types or objects are involved would be brilliant. Thanks!