The Hawkeye Pro MicroFlex Semi-Rigid Borescopes .035? from Gradient Lens Corporation is a Borescope with Depth of Field(DOF) 2 to 5 mm, 1mm, Viewing Angle 0 Degrees, 90 Degrees, Field of View(FOV) 55 Degree, Operating Temperature -18 to 77 Degree C, Probe / Insertion Tube Diameter 0.9 mm (.035 Inches), 1.5 mm (.059 Inches). More details for Hawkeye Pro MicroFlex Semi-Rigid Borescopes .035? can be seen below.