Binghamton, NY Nov 10, 2009 #seven I am not familiar with meter operation, but I would suspect that it ought to send the switching voltages (13v for odd and 18v for even). And, if you must see the opposite sats it needs to mail the 22khz tone. When in search https://dienphucthinh22.wixsite.com/home/post/cap-quang-panduit-chinh-hang