Timing to 1/5 second. 

Timing up to 30 minutes. 

Timing telephone conversations. 

Pulsemeter scale. 

Asthmometer scale [T]. 

The asthmometer scale shows at a glance the number of respirations per minute. The observer releases the chronograph hand as the patient begins a respiration and stops it on completion of the 15th, the 20th or the 25th respiration, according to the basis of calibration indicated on the dial. The hand shows at a glance the number of respirations per minute.

T = Asthmometer scale