Amprobe 15XP-A Full-Purpose Compact Digital Multimeter 3-1/2 digit liquid crystal display (LCD) with a maximum reading of 1999 Automatic, positive implied, negative polarity indication (OL) or (-OL) is displayed Operating Environment 0 C to 50 C at &lt;70 % R.H. Storage Temperature -20 C to 60 C, 0 to 80 % R.H. with battery removed from meter