Hi!
I found one strange apparatus. It has very dark blue hood and inside there is electronics plus two _blue_ optoelectric components about 20 cm apart. It has multiple mechanical adjustments. It must be some kind of burglar alarm detector. It's made in Japan and the only type is: "IS 440" and "447 100". and "Range 100 meters". Can someone tell me what this is?
Thanks!
Matti Kaki OH2BIO