Answer :

A weighing scale. If you're talking about the day of judgement, your good deeds and sins will be kept in each and if the sins are more than good deeds, you go to hell, if good, the heaven =)
Yes a weighing scale but it can be viewed with symbolism, such as good or bad, law and order.  It is a weighing scale matter of factly, but the interpretation of what is yours to come up with