Assertion: sight | /r/CapableOf | work under all weather conditions
Facets:
value: for 15 years
type: TEMPORAL
Source sentences:
text: Tritium is a substance that ‘self-illuminates’, which means it is maintenance free, does not need any external sources of energy to work, and is fail-safe, so much so that Meprolight provides a guarantee that these sights will work under all weather conditions for 15 years.