Solid negative ion detector with printing can test products with different properties such as solid, liquid, and powder. The solid oxygen negative ion detector adopts advanced GM ion detection technology from the United States, which can accurately detect negative ion concentrations from 0 to 9999/cc. At the same time, printing function is added, and users can choose a printer for real-time detection and printing. It is an auxiliary tool for research and development institutions, negative ion health product chain institutions, textile health product performance evaluation, various negative ion product research and development, and sales. Solid negative ion detector with printing