Casella USA offers an intrinsically safe version of its APEX personal sampling pump. Following testing, the pumps have been granted both UL and ATEX approvals for use in many hazardous areas. Two versions are available: the Apex Standard IS and the advanced Apex Pro IS, featuring programmable start and stop timers and a TWA mode that spreads a measurement out over the whole day.Casella USA, Amherst, NH.