i trying to install the kasa 3 way switch  but it clicks i tried different ways...  didnt help then i took multi meter and tested

so 1 the 

yellow line -  white wire.. but its Hot Wire  171ACv - square around the yellow is a Merret in box

black line leaving the box is i guess the wire to the Light   

those are the 14gauge wire  so i dont know where they coming from

yellow wire  - white wire hot wire to the 2nd box

red and black wires are the travelers

brown wire - is the copper wire to the box's  and i forgot to add the copper brown wire coming in from the bottom of the box with the white and black wire

what i have tested is 

White wire to Ground of Box  171AC 

Traveler to Ground Box 68AC v  and 171AC volts  - when you toggle the 3 wire in thje 2nd box    it then flips V around 171AC on the other traveler nad 68AC on the other

no voltage at the light ..  so why is this wired like this? why am i getting 171AC  unless my digital meter is messed  i should onlt get like 110-115VC ac  here in canada... so what is it why is it so messed up and is it even possible to wire a kasa switch  in  or i have to stay with just plaine toggle switch 

and when i use a pen electrical detector  and prob the 2 travelers and white wire.. it all goes off showing i getting AC power on them

and i tried adding the kasa switch in the first switch box  left one in the pic

and i included pic