This Ryobi Stud Finder model ESTP004 has been tested and is in working condition. It is suitable for both wood and metal materials. The unit requires a battery cover, which is not included in the sale. The brand of the stud finder is Ryobi and the model is ESTP004. In terms of type, it is a stud finder. The material used to make this stud finder is metal. The categories under which this product falls are Home & Garden, Tools & Workshop Equipment, Measuring & Layout Tools, and Meters, Sensors & Probes.