The VES 020 1000 4 from Gradient Lens Corporation is a Borescope with Depth of Field(DOF) 3 to 50 mm, Viewing Angle 0 Degrees, Field of View(FOV) 100 Degree, Probe / Insertion Tube Temperature -20 to 60 Degree C, Operating Temperature -10 to 50 Degree C (Display unit). More details for VES 020 1000 4 can be seen below.