New inventions are kept coming in in our technologically driven society. An optical tool used for inspections of bores and cavities in, fuel injectors, engine cylinders, turbine blades, hydraulic manifolds, and pipes and seals, consists of tube with an eyepiece on one end a lens on the other. It is made to go through very small openings that will allow users to see the interior of an object without breaking the parts and gives a wide-angle view of the interior. It is a tool for viewing inside things and is similar with a medical equipment endoscope that is used for viewing insides of a human body. It ranges from about 0.5 mm up to 12 mm diameter. This tool is the borescope. Borescope is very useful. It is used by engineers, technicians, mechanics and quality control departments and it allows the user to see defects of the interior part of an object that maybe undetected and cannot be seen by the naked eye at may cause a potential failure and it also helps the user not to dismantle the object which is more costly and very time consuming.

The process of manufacturing borescope is very complex and intense. It is usually made by hand not with any equipment and it requires great cleverness in assembly. Even slightest mistake can cause the borescope completely unusable.

So what should we consider when purchasing a borescope? One of the important aspects to be considered is the diameter. It must be able to pass through the smallest hole and be able to move when inside. The best thing is to try to fit the borescope before purchasing it. The next thing to consider is the length. Chose the one that can penetrate to the greatest depth required, but as long as to be unwieldy outside the hole. Another one to consider is the direction of view. The direction of view is the angle from the axis of the center of the field of view. When checking a borescope in way like a rifle barrel, a 90 degrees mirror tube will be great. Field of view is another aspect to consider. It may be very wide, medium or narrow. The wider the field of view the lower the magnification and the narrower the field of view the higher the magnification. The last thing to consider is the magnification. The borescope has greater magnification when the object is closer to lens of the device. You must know the distance of the subject from the lens to calculate the magnification of the scope.

Before purchasing any device not just borescopes, you should always remember to check before getting it to avoid malfunctions. Though there are some seller who still accepts returns change product, but not everyone does it. One should see to it that, the one he got is perfectly what he needed. It may be harmful and may cause failure when you didn't choose the right thing.