1. Clear and Easy to Read: Our gauge inside caliper pointer readings are clear and easy to read, with longer life and high accuracy to help you minimize measurement errors. 2. Specifications and Measuring Depth: Gauge inside caliper is available in 55‑153mm or 2.2‑6in with a reading of 0.01mm and a measuring depth of 90mm or 3.5in. 3. 10 Replacement Heads: The gauge inside internal caliper kit contains ten interchangeable internal caliper heads with different ranges and specifications to use according to the actual situation. 4. Aluminum Material: Gauge inside caliper is made of aluminum alloy material with exquisite craftsmanship, wear and practical, which can be used stably. 5. Widely Used: Our inside caliper is widely used for the measurement of all kinds of bore, inside diameter, inside groove size. Item Type: Gauge Internal Caliper . 55-153mm/2.2-6in Reading Value: 0.01mm Error: ±0.02mm Measuring Depth: . 90mm/3.5in Use:Widely used in all kinds of internal holes, internal diameter, internal groove size measurement How to Use:Direct installation and use. Color:As Shown Material:Metal+Plastic Package Contents: 1 * Gauge internal caliper set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.