Worth investigating: NEW Walabot DIY Stud Finder In-Wall Imager.

You could consider *avoiding* the metal studs. Use proper drywall anchors for #12 screws. Drywall is very strong if the pressure of a fastener can be spread out.

If you are installing many kitchens, I would think you should get a professional expert to recommend the fastening system for hanging cabinets on 1 inch thick drywall on "heavy gauge" steel studs.