Strela Men's Watch with Sea-Gull ST1901 Movement Chronograph Hand Winding Medical Doctors Pulse and Breath Meter, Med40lab, Strap.

Asthmometer scale (breathing frequency): This scale allows you to measure the respiratory rate, i.e. the number of breaths per minute. To determine the breathing rate, start the chronograph at the beginning of a breath and stop it after five breaths. The second hand then shows the breaths per minute. Pulsometer scale (heart rate): This scale is used to measure the heart rate, i.e. the number of heartbeats per minute. To determine the heart rate, start the chronograph and count 30 pulse beats. Then stop the chronograph, and the second hand shows the heart rate per minute on the pulsometer scale. Tachymeter Scale: For measuring speed and distance. Casing: polished stainless steel/brushed: strap lug width 20 mm, sapphire glass, steel base + glass base, diameter 40 mm, height: 14 mm, strap lug to lug: 50 mm, water resistance 10 ATM The MED40LAB model features a glossy black dial with appliqued gold indexes and raised Superluminova dots for best readability at night.