You really want the UV because it really makes it obvious where the leak originates from. You may not be able to see that otherwise. I've had shop trace down coolant and oil leaks and it is plain as day when you hit it with the black light. It only cost 20.00 or so last time I had it done.
2003 TJ, 33" BFG AT, 2" BL, 2" BDS spring lift, 55w DDM HIDs