2-in-1 caliper and ballpoint pen with transparent graduations for precise measurement, lightweight plastic ruler for students, black (blue refill)

Dual-function design: Combines a caliper and ballpoint pen to measure thickness or length while instantly taking notes. Precise measurements: Clear graduations engraved on the edge of the ruler for accurate readings at the office or school. Portable and lightweight: Compact plastic construction easily fits in pockets or pencil cases for indoor and outdoor use. Student-safe: Smooth ink refill ensures clean, edge-free writing, ideal for children and everyday use. Versatile use: Perfect tool for engineers, teachers, and students who need quick measurements and writing.