Does anyone know of a beam type sensor that will work over long distances? I am looking to sound an alarm if anyone tries to stack a rack over a certain hight. The rack is about 150' long so i am looking for a transmitter at one rend and a reciver at the other..the other option i could use is a cable type system...but was wondering if you guys know of a sensor (such as a lazer) that works across that kind of distance??
Thanks
Darren
Thanks
Darren