CHQ-SZM/M(SCI) Hochiki Marine Approved Single Zone Monitor with IsolatorManufactured by Hochiki, this Hochiki CHQ SZM M (SCI) Marine Approved Single Zone Monitor with Isolator is a marine approved single zone monitor designed to allow up to 6 conventional detectors to be interfaced to Hochiki's ESP analogue addressable system. The unit features an integral short circuit isolator and utilises simple DIL switches for reliable addressing. A back box is also available (CHQ BACKBOX) (6. 31) which, when used in conjunction with