The Yateks M-series from Yateks is a Borescope with Depth of Field(DOF) 7 mm to Infinity, Viewing Angle 80 Degree, 110 Degree, Probe / Insertion Tube Temperature -20 to 70 Degree C, Operating Temperature -10 to 50 Degree C (Monitor), Probe / Insertion Tube Diameter 3. to 6 mm. More details for Yateks M-series can be seen below.