Precise head size tool - High-precision measurement scale with error-proof calibration technology provides reliable head circumference accuracy with every use. Comfortable grip - Ergonomic, non-slip handle follows the palm curve for long sessions without fatigue. - Auto-return/reset function enables easy, effortless operation. Robust material - Built with stable materials that resist deformation and oxidation. - Maintains long-term accuracy and a polished appearance through regular handling. Advanced hat production support - Integrates precise manufacturing techniques, optimizes cut patterns, and captures critical inner diameter data to improve production efficiency. Use scenarios - In design studios for quick, repeatable head-size verification during hat sample development. - On production lines to ensure batch-to-batch sizing consistency across hats. - For custom fittings and alterations to capture precise inner dimensions for tailored hats.