* A on/off, h/t,°f/°c function
* B on/off, h/t, max/min (°f/°c) memory recalling function
* C on/off, °f/°c, max/min (°f/°c) memory recalling function
* Specification:
     Measurement range: [-50°c ~ +300°c or -58°f ~ +572°f]
    [-50°c ~ +150°c or -58°f ~ +302°f]
* Resolution :0.1° for -19.9° ~ +199.9°, otherwise 1°
* Accuracy : [±1°c in the range of -30°c ~ +150°c]
    [±1.8°f in the range of -22°f ~ +302°f]
    [±1°c in the range of 151°c ~ +250°c], otherwise more than± 2°c
    [±1.8°f in the range of 303.8°f ~ +482°f], otherwise more than ± 4°f
* Ambient temperature for plastic casing: -10°c ~ +50°c or +14°f ~ +122°f
* Battery : 1 x 1.5v "g13 /a76" size or equivalent batte