I have just made a pipe half of which is copper and the other half is acrylic tube (soft). If I fill it with hot water the copper feels hotter than the acrylic, but if I put my temperature reader up to it the acrylic reads as being hotter - copper = 27 deg.c acrylic = 32 deg. c.
This cannot be correct! I am not able to check if the readings are correct with another instrument.
How can it be explained - does it look wrong to anyone else? Could there be different wavelengths that my instrument (cheap off ebay) is reacting to (say shorter from the copper but longer wavelengths from the acrylic)?