This review is from: TRIXES Digital Thermometer with LCD for Fridges Freezers
Dont expect too much accuracy and you will be happy.
Its a low cost indicator not a scientific instrument.
Not what is on the acompanying picture (a freezer thermometer).
Its a max/min thermometer.
Bit like the instructiuons really,
fiddle with it and make it work but dont expect any explainations.