What kind of damage can a 600mw laser pointer do?

Question

such as the ones seen at tech lasers?

Answer 1

When I took holography we were taught that a laser is safe up to 250 mW. It's strange that Tech lasers web page does not link to more specific information.

600 mW should be treated with great caution; do not let the beam strike your eye, for example, as it very likely could damage the retina. Wear goggles at all times. It also appears it can start fires.