 The lab contained a cloud chamber allowing the viewer to watch alpha particles traveling at , a spinthariscope showing the results of radioactive disintegration on a fluorescent screen, and an electroscope measuring the radioactivity of different substances in the set.In 2006, Radar Magazine called the lab set one of "the 10 most dangerous toys of all time, ... exclud[ing] BB guns, slingshots, throwing stars, and anything else actually intended to inflict harm", because of the radioactive material it included (it was number 2 on the list; number 1 was lawn darts).Gilbert's promotions claimed that none of the materials could prove dangerous.