Vividia ET-066 Ultra Thin Industrial Borescope can be used in precision manufacturing, medical devices, medical research, quality control, energy machinery, advanced instrument, etc. The key features of ET-066 are 0.66mm / 0.026" diameter camera probe with relatively good image quality.
Fiberscope ET-066 

Model:                        ET-066
Resolution Pixel：        10,000
Tip diameter：            0.66mm / 0.026"
Rigid probe：              60mm / 2.4" 
Flexible probe tube:    600mm / 24"
Total probe length:      750mm / 29.5"
Depth of Field :           2~30mm
Field of Angle:             90°
Light Source:              Portable LED light, dimmable
Probe tip material:       Nickel-titatium alloy metal tube
Eyepiece diameter:      32mm standard eyepiece

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​What are included in package: Vividia ET-066 fiberscope with a portable light source; rechargeable Li ion batteries; AC charger; user manual; card reader; heavy-duty hard case.
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et-066_et-078_user_manual_english.pdf
Download File
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ET-066 rigid probe tip dimensions
Pictures taken with ET-066M35 fiberscope monitor bundle
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ET-066M35 Bundle: ET-066 Fiberscope and ECS-935 portable camera with monitor

Other less than 1mm diameter borescopes and fiberscopes:
Diameter 0.66mm,    ET-066 fiberscope
Daimeter 0.78mm,    ET-078 fiberscope
Diameter 0.95mm,    FC-09510 USB borescope
Diameter 0.95mm,    VK-0-09510 video borescope 5" monitor