An apparatus and method for opening sealed containers includes, in a container with a removable seal, container packaging, with a removal end and a closed end, conformed to receive and removably retain the container. Because the wavelengths are not converted, first laser beam and second laser beam oscillated from first semiconductor laser element and second semiconductor laser element are emitted without generating energy losses of first laser beam and second laser beam. The focus point measuring device may include a substantially planar target surface defining a plane, and a ruled target surface inclined at substantially 45\xb0 to the substantially planar target and extending through the plane thereof, marked to indicate respective distances in front of and behind the plane.