Some monitors enable parents to speak back to their children through a portable handheld unit. (10exposed.com)
$ 18,000 handheld units carried by technicians are not limited to single turbines, but also do not provide a database of ongoing readings for diagnostic comparisons. (greentechmedia.com)
With an output of 50 watts — 1000 times more powerful than a typical handheld unit — the laser is tuned to sodium atoms» strong yellow emission at 589 nanometres. (newscientist.com)