How to test a pen
How to test a pen in third-party inspection 1. Appearance inspection: Check whether the appearance of the pen is intact, whether there are defects, deformation and other problems. Through visual inspection and hand feeling methods. 2. Writing performance test: Use professional writing test instruments, such as writing test machine and handwriting clarity tester, to test the writing fluency, handwriting clarity and ink drying speed of the pen. 3. Ink quality detection : Use chemical analysis methods such as spectrophotometry and chromatography to detect the color, concentration and stability of the ink. 4. Pen core quality detection: Use measuring tools such as calipers and hardness testers to detect the size, material and hardness of the pen core. 5. Safety detection: Use chemical analysis methods such as atomic absorption spectroscopy and gas chromatography to detect whether the pen contains harmful substances such as heavy metals and volatile organic compounds...