Features: 1. Stainless steel ruler body, high strength and durable 2. Lock nut, fine-tuning roller, accurate reading, easy to use 3. Magnetic scale film with high-definition scale for easy reading 4. The product is easy to use and widely used 5. Closed pulley for higher measurement accuracy Specification: Name: plastic head stainless steel ruler body digital caliper Measuring range: 0-150mm Material: stainless steel + ABS Display mode: digital display Scope of application: measuring inner and outer diameters Packing: plastic box packing Battery: 2* button battery (external battery shipped) Package includes: Type A: Two single-digit calipers*1+Battery*2 Type B: Metric inch caliper*1+battery*2