i didn’t use any resistor, because the resistor is build in the reed contact i think. I don’t know what resistor is build in…
and the cables, i can’t say the thickness, but it’s a little more than lan-cables i think. i use the same cables with more than 4 meters for the dht22 in my bedroom. if you give me your mail adress, i send you a photo from the reed an the cables?