The B950DM from Yateks is a Borescope with Depth of Field(DOF) 100 mm (F10), 50 mm (S5), Viewing Angle 90 Degree, Probe / Insertion Tube Temperature -10 to 60 Degree C, Operating Temperature -10 to 50 Degree C (System), Probe / Insertion Tube Diameter 9 mm. More details for B950DM can be seen below.