2097/2297 are nice, 7093 is a bit better as the plastic casing provides a bit of protection against the rain. 60926 is anecdotally proven to work in environmen

2097/2297 are nice, 7093 is a bit better as the plastic casing provides a bit of protection against the rain. 60926 is anecdotally proven to work in environments highly polluted with oily crystals for at least a few hours.