...irt 4520 model for nearly 2 years now and most recently I tried to use on my son with new batteries and still won't turn on. I stored it in side drawer in our room without batteries to have a longer ...
...IRT 4520). After about 3 seconds the display will show this sequence: «°F» / «SET» / «°C» / «SET» ... (3) Release the Start button / «I/O» ...
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