What is a Sewer Inspection Video Camera?

A drain camera, also known as a sewer camera or pipe inspection camera, is a specialized waterproof camera attached to a flexible cable used to inspect the interior of pipes and drains. 
This allows plumbers and homeowners to diagnose problems like clogs, cracks, or collapsed pipes without needing to excavate or dismantle plumbing systems. 

These  sewer cameras offer a wide range of benefits for plumbers, engineers, and maintenance workers by allowing them to visually inspect the condition of sewer lines without the need for costly and time-consuming excavation.
CCTV drain cameras are used to uncover any damages or obstructions within the plumbing system.[They provide a non-invasive and efficient way to assess the internal condition of drainage pipes and sewer systems, ensuring that issues are accurately identified and addressed without the need for disruptive excavation or guesswork.

Sewer cameras, used for inspecting pipelines and drains, come in various types, each designed for specific needs.  
Below is the types:
push rod cameras
360 pan-and-tilt cameras
crawler pipe cameras
 wireless sewer cameras
dual-lens  sewer cameras

It was made up of below parts:
All in one control recording monitor, in the market, there are 5 inch monitor, 7 inch monitor, 9 inch monitor ,10.1 inch monitor, 13.3 inch monitor
Camera head:  from small to large in the market: 7mm-9mm-14mm-23mm-29mm-30mm-32mm-35mm-45mm-55mm, include pan-tilt camera head.
Push rod cable &Cable reel , there are different type , different color and different length . Usually, 30m/98FT is common.

the depth of field (DOF) refers to the distance range in front of the borescope's tip where objects appear in focus.
23mm camera head or smaller size than 23mm camera head  is for optimal performance in 2" to 4"  small pipes.
most of the 360 pan tilt camera is good for inspect pipes 8''-80'' depends one different camera supplier.            
 

How to choose a drain camera?