What kind of batteries do Zircon stud finders use?

9 volt battery

Most Zircon StudSensor™ and MultiScanner® stud finders require one brand new alkaline 9V battery (with an extended expiration date) for proper operation. Please be sure to refer to the instructions for the specific model you have.

Note: The MultiScanner® x85 requires three AAA (LR03) batteries.