Suunto 9 Peak Pro was tested according to the MIL-STD 810H military-grade standard to ensure maximum reliability and durability and it passed all of them.
List of the tests:
MIL-STD-810H - Test Method 500.6 Low Pressure (Altitude)
MIL-STD-810H - Test Method 501.7 High Temperature, operation
MIL-STD-810H - Test Method 502.7 Low Temperature, operation
MIL-STD-810H - Test Method 503.7 Temperature Shock
MIL-STD-810H - Test Method 507.6 Humidity
MIL-STD-810H - Test Method 509.7 Salt Fog
MIL-STD-810H - Test Method 516.8 Shock
MIL-STD-810H - Test Method 516.8 Drop
MIL-STD-810H - Test Method 521.4 Icing/Freezing Rain
MIL-STD-810H - Test Method 505.7 Solar Radiation
MIL-STD-810H - Test Method 510.7 Sand and dust
U.S. MIL-STD-810 is a United States Military Standard that emphasizes tailoring an equipment's environmental design and test limits to the conditions that it will experience throughout its service life, and establishing chamber test methods that replicate the effects of environments on the equipment rather than imitating the environments themselves.