The M120 Series Thermometer's bright display has two key attributes: First, the 50ft (15m) viewing distance allows you to view it from afar. Second, the wide 130° viewing angle lets you read the display far to each side.
Combine these and a TempEye° M120 Series Thermometer is visible from 84% of the area in a 50x50ft (15x15m) room. Here's the math . . .
( (π x 50ft x 50ft x 60°/360°)
= 2,101ft / 2,500ft