How warm is it? How warm does it feel? The HW30 combines a professional level stopwatch to temperature, humidity and heat index readings. User settable heat index alarm. Stopwatch/chronograph mode with 1/100 second resolution. Fastest/slowest/average lap recall. 99 lap counter with 30 lap/split memory. 10 hour countdown timer with audible beeper warning for the last 5 seconds. Programmable alarm. Calendar mode displays day, month and date. 12 or 24 hour clock operation. Complete with breakaway safety lanyard and one 3V CR 2032 battery. One year warranty.