保加利亚卫生与职业病研究所研制出一种命名为的仪表,用来显示并测定空气中有害气体或蒸汽的浓度。仪表共有52个型号,分別用于检测空气中可能含有的各种有害物质,例如氯、氨、氯化氢、汽油、汞蒸汽等。这种仪表外形和圆珠笔差不多,有一根玻璃管,里面装有白色粉剂,表面象温度计 The Bulgarian Institute of Hygiene and Occupational Diseases has developed a device called Nomenclature that displays and determines the concentration of harmful gases or vapors in the air. A total of 52 models of instruments were used to detect the air may contain a variety of harmful substances, such as chlorine, ammonia, hydrogen chloride, gasoline, mercury vapor and so on. This instrument appearance and ballpoint pen almost, there is a glass tube, which contains white powder, the surface like a thermometer