Measuring elevation and height can be handy for working on uneven terrain. At 111 grams, this tiny, lightweight laser tool packs lots of options, and can take measurements as far as 80 feet away ...

1 kilogram is much heavier than 1 gram. 1,000 times heavier! Together 6 medium-sized apples might have a mass of 1 kilogram. Measuring how heavy something is can be really useful. For example ...