It is common among students to develop their skills while studying, and it demands educators improve their learning quality. Development of an Advanced Virtual Physics Laboratory (Adphylab) in the Geiger-Muller Counter practicum to facilitate students' science process skillsĀ in the Physics Education of Sultan Ageng Tirtayasa University. The research method used is research and development (R&D) with the Rowntree development model. Adphylab in the Geiger muller counter practicum has four menus, including insight, design, time for action, and a summary called WaRa-WiRi which can be accessed easily via the web. The results of the due diligence by material experts at the Adphylab practicum Geiger muller counter obtained a percentage score of 94% with very feasible criteria, and the results of the due diligence by media experts obtained a percentage value of 96% with the very feasible category. The results of the students' limited test responses to Adphylab in the Geiger Muller Counter practicum obtained a score percentage of 90% in the very feasible category.
                        
                        
                        
                        
                            
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