Testo has always focused on portable on-site measurement, which is fundamentally different from instrument brands that focus on laboratory equipment. Founded in Germany, it takes solving the pain points of front-line field testing as its core, and integrates German precision manufacturing technology with portability and simple operation, so that professionals can complete accurate measurement and data recording without returning to the laboratory. It has formed an irreplaceable reputation in the subdivided fields of HVAC system commissioning, boiler flue gas emission detection, food production site hygiene testing, etc. Its products support wireless data transmission and automatic compliance report generation, which greatly reduces the work burden of on-site personnel, and is widely used in more than 100 countries and regions around the world.