Answer:
<em>When using the triple beam balance, it is recommended that one start with the lowest level of precision (e.g 100 gram increments). For example, if an object weighs 327 grams, the 100 gram pointer will drop below the fixed mark on the 4th notch (400g); it will then need to be moved back to the third notch (300g).</em>
Is life that exists only off our planet,
No aliens have been seen/found yet, but it is a strong theory as the universe is very large.