My tilt is in a SS bucket fermenter... Inside a freez-mentor... I can set my phone on the lid and it will pick up the readings... If I get much further away, it'll not pick up the signal. Problem? Not for me. I can get the info I need without doing any opening and moving stuff around... So let's say, it is a handy tool, pricey, but it saves some steps and possible O2 exposure...... Sneezles61