Cheap sensors? Co2, temp and RH

[Blakeja]

Hey fellas curious if anyone can make sense of these whacky fucking temp/rh meters that don’t jive.

are they just cheap junk? None of the three match my RH controller either so I want accurate readings to calibrate it too.

any alternatives that won’t break the bank? Also looking for co2 monitoring to see how affective my exhale bag is.