TESLONG focuses on firearm barrel borescopes designed for fast, visual diagnostics: inspecting rifling, chamber, crown, and spotting carbon/copper fouling or pitting. The lineup includes rigid and flexible options with adjustable illumination and HD sensors for crisp imagery. Depending on the model, operation runs through a dedicated display or mobile/PC, with insertion guides and side-view mirrors. Goal: deliver reliable visuals to decide on targeted cleaning or maintenance action, whether at the range or in the workshop.