1. Tools: This product is both a vernier caliper and a ballpoint pen, which can write and measure for students.

2. 1.0MM refill: This ballpoint pen has a 1.0mm blue refill, which creates a better writing experience for you, suitable for writing.

3. Smooth writing: The handwriting of this ballpoint pen is smooth and durable, suitable for writing and taking notes.

4. Applicable occasions: Vernier calipers and ballpoint pens are suitable for offices, schools, woodworking, and homes.