A: Hello Royce. On the back of the unit there is a battery cover that opens for the installation of a 9 volt alkaline battery. The full instructions for the HD55 can be found on the Zircon website. Thank you.
A: Hello. Due to the variables in materials and construction techniques on exteriors Zircon stud sensors are recommended for interior use only. A number of our stud sensors are capable of scanning through most types of plywood and some types of siding but once again the construction techniques used with these materials can adversely affect the reliability of the tool's readings so we suggest indoor use only. If you have more questions please contact our tech support through the Zircon website. Thank you.
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