Having a tool that can perform multiple functions is essential especially when extensive travel to the job site is required.  That is why we like the Zircon Multiscanner i700.  This model has multiple modes to help you find wooden or metal studs, metal pipes or rebar plus an AC scan mode to find hot electrical wiring – even through plastic conduit.  It also has an error correcting mode to help eliminate common user mistakes.  Don’t worry if its sounds a bit complicated, a how-to DVD is also included.