The complete guide
How To Choose And Use An Endoscope Inspection Camera
The problem with not being able to see
Almost every awkward home or workshop job comes down to the same thing. There is a space you cannot see into, and the only way to find out what is happening in there is to take something apart.
So you take it apart. You lift the floorboard, cut the plasterboard, pull the dashboard trim, remove the trap under the sink. Half the time you find nothing, and now you have a repair on top of the original problem. The other half you find the fault, but you have already spent an hour getting there.
An endoscope inspection camera skips that step. You push a thin probe through a gap, a drain, a vent or a drilled hole the size of a pencil, and you look at your phone. If the answer is "nothing is wrong in there", you have saved yourself the dismantling. If the answer is "there is a tree root through the pipe at about two metres", you now know exactly what you are dealing with before you call anyone.
How a phone borescope actually works
The parts are simple. There is a tiny camera sensor in a head at the end of a cable, a ring of LEDs around that lens so the camera has something to see by, and a plug at the other end that connects to a screen. On this one the screen is your phone, which is why it is cheap compared to the handheld units with their own display.
This model uses a CMOS sensor recording 1080p video as MP4 and stills as JPEG. There is no autofocus and no zoom. That sounds like a limitation until you use one. In a pipe or a cavity you are working at close range, and a fixed focus lens tuned to a set distance gives you a more consistent picture than a cheap autofocus hunting back and forth in low light. The working range here is roughly 2 cm to 10 cm. You frame the shot by moving the probe, not by tapping the screen.
The eight LEDs are adjustable, and that adjustment is more important than the total brightness. Point a bright light at a wet pipe wall from 3 cm away and most of it bounces straight back into the lens. Turn it down and detail appears. Anyone who has used a fixed-brightness borescope knows the frustration of a picture that is simultaneously too bright in the middle and black at the edges.
Connection is wired. No WiFi hotspot to join, no pairing, nothing to charge. You install Usee Plus, plug in with the supplied iPhone or micro USB adapter, and the live feed opens. For a tool you use occasionally that matters a lot, because wireless inspection cameras have a habit of being flat or refusing to pair on the one day you need them.
Why the cable type matters more than the pixels
People shop these cameras on resolution. In practice the cable decides whether you get a usable result.
A soft, fully flexible cable is easy to coil but useless for pushing. Feed it into a horizontal pipe and it concertinas. Point it at a ceiling cavity and it droops. A fully rigid rod goes where you push it but will not turn a corner, so it is only good for straight shots.
Semi-rigid is the compromise, and it is what you want for general use. You can bend a hook into the last stretch of cable so the lens looks sideways at the pipe wall rather than straight down the middle of it, and that bend stays put. You can push two or three metres into a drain and the cable transmits that push instead of folding. You can also straighten it out again afterwards.
Five metres is a sensible length for domestic work. It covers a kitchen waste run to the stack, most gutter and downpipe checks, a full wall cavity from the top plate, under a floor between joists, and the length of a car's chassis rail. Much longer and you need a reel and a proper feed system to stop the cable fighting you.
Probe diameter is the other number to look at. At 7.9 mm this head goes through a 10 mm drilled hole, down a standard sink waste, through a spark plug hole on many engines, and between most trim panels. Thinner probes exist but they generally carry smaller sensors and weaker lights, so you trade picture quality for access.
Who gets the most out of one
Homeowners use these mostly for water and pests. Finding where a drain is blocked before calling a plumber, checking for damp or rot inside a cavity, looking behind a washing machine without dragging it out, tracing a bad smell to a dead mouse under the floor. Knowing what the problem is changes the conversation with a tradesperson and usually the price too.
Home mechanics get even more use out of it. Cylinder bore checks, looking for a dropped bolt on top of a gearbox, inspecting behind the dash before pulling the whole thing out, checking for rust inside sills and chassis rails. A good mechanic borescope is one of those tools that stays in the toolbox for years.
Renovators use them before cutting. Checking what is behind a wall before a drill goes in is a cheap habit. So is confirming the insulation actually reached the top of the cavity.
Then there is the odd job category. Fishing something out of a drain, checking a chimney, looking inside a hive, inspecting a water tank, checking a gutter without climbing a ladder twice. People buy it for one job and then use it for ten.
Choosing the right one for you
Work backwards from the job. Ask how far in you need to reach, how wide the entry point is, and whether the space will be wet.
If your reach is under five metres and your access points are 10 mm or wider, a 7.9 mm probe on a 5 metre semi-rigid cable covers it. If you need to inspect sewer mains fifteen metres out, you need a different class of equipment entirely, with a reel and a self-levelling head.
Check the waterproofing rating against your use. IP67 on the camera head means it handles immersion, so standing water and wet drains are fine. Remember the rating applies to the probe end, not the phone and not the plug.
Think about the display. A phone-based camera is cheaper, the screen is bigger and better than most built-in displays, and you already know how to use it. The trade-off is that your phone is tied up during the inspection and you have one more cable to manage. If you work in conditions where you would rather not have your phone out at all, a self-contained unit may suit you better.
Finally, be realistic about lighting. Any claim of great low-light performance from a sensor this size is really a claim about the LEDs. Adjustable brightness is the feature that matters, and this one has it.
Looking after it
These cameras are not fragile, but they do have two weak points.
The first is the cable where it meets the camera head. Do not use the camera as a hook or pull it out of a pipe by yanking the lead. Feed it in and draw it out gently, and if it snags, back off and try a different angle rather than forcing it.
The second is the same bend repeated in the same spot. Semi-rigid cable tolerates a lot of shaping, but working it hard in one place over and over will eventually tire it. Vary where you bend it, and store it in a loose coil rather than wound tight around your hand.
Clean the lens after every job. A smear of drain grease or oil on the glass will ruin the picture and you will blame the camera. A damp cloth and a dry-off is all it takes. Keep the connector end clean and dry, and never let water track down the cable to the plug while it is connected to your phone.
The short version
This is a wired, phone-powered inspection camera with a 7.9 mm head, 5 metres of semi-rigid cable, eight adjustable LEDs and an IP67 waterproof probe. It records 1080p MP4 video and JPEG stills through the Usee Plus app on Android 6 or later and iOS 9 or later, with no charging and no pairing.
It is the right tool if you want to see inside a drain, a wall, a vent or an engine without taking anything apart first, and if your access points are around a centimetre or wider. It is the wrong tool if you need long sewer runs, micro-diameter access or a fully self-contained handheld unit.
For most people the test is simple. Think of the last time you had to cut, lift or dismantle something just to look at it. That is the job this would have saved you.