- Acto Helix PCD kit test (process challenge device) is used as daily test for pre-vacuum hospital sterilizers and for bench top steam sterilizers class B for steam penetration and inert gases. The Helix PCD test is an excellent test to detect even the smallest amounts of inert gases and steam penetration capabilities. Acto Helix PCD kit test is not replacing routine monitoring of sterilization cycles. This should be done by lot control sets and/or with unpack integrators. Pack Contains : - Single pack 250 strips. - 1 Tube. **For further product information, please contact Chat Support**