The Ch-2-6-1000 from USA Borescopes is a Borescope with Depth of Field(DOF) 5 to 100 mm, Viewing Angle 0 Degree, Field of View(FOV) 55 Degree, Operating Temperature -10 to 80 Degree C, Probe / Insertion Tube Diameter 4 mm (0.157 Inches) / 6 mm (.2362 Inches). More details for Ch-2-6-1000 can be seen below.