this morning while i'm putting on my watch... and enjoying my ice cream
i was thinking to test my ball tmt working well and accurate
so i put it into my fridge....
but then i forgot about it when my bb wake up.....
1 hour later
there u go
a frozen ball
-15 degree c... still running
cant see it right? nah...
this is in normal room temperature for your comparison
the test tells
1. ball -40 endurance, the special oil is working below zero degree
2. the mechanical thermometer is working well