The PSB probe is about the same price as the Morris (about $40) and much more
sensative. I can see if neighbors across the street have their living room
lights on from inside my house so long as my lights are off and the neighbor's
outside lights are off.
Tom
Tom Brennan KD5VIJ, CCC-A/SLP
web page http://titan.sfasu.edu/~g_brennantg/sonicpage.html