This study aims to determine the quality of the Biology instrument items on the digestive system material with the Rasch model for analyzing critical thinking skills. The research employed a quantitative descriptive method involving 63 students of senior high schools in Yogyakarta. The data were collected using a critical thinking skills description test and processed using the Rasch ... https://www.elphonsolam.com/product-category/balloons-mini-foil-number/