Note: costs mentioned below are given in US dollars as a general point of reference — actual prices vary by country, currency, and local market.
Budget Wi-Fi/USB borescopes cost $15-$40 and connect to a phone or laptop screen, while sturdier units with a built-in display run $50-$150. Look for a camera diameter of 5.5mm or smaller to fit spark plug holes and tight gaps, a cable length of at least 3-5 feet, waterproof rating for fuel/oil exposure, and adjustable LED brightness to avoid washing out close-up shots on shiny metal.
At a glance
| Factor | Typical range / spec |
|---|---|
| Price (phone/app-connected) | $15-$40 |
| Price (built-in screen) | $50-$150 |
| Camera head diameter | 4.5-8.5mm (5.5mm or less for spark plug holes) |
| Cable length | 3-16 feet depending on model |
| Waterproof rating | IP67 common for the camera head |
Common uses for a car borescope
A borescope lets you see inside places a hand or eye can't reach — spark plug wells to check for carbon buildup or coolant intrusion, exhaust and intake tracts, behind dashboards for wiring, and inside door panels or rocker sills for rust before buying a used car. It's one of the more versatile cheap diagnostic tools a DIYer can own.
Camera diameter and cable length
For engine work like inspecting a spark plug hole or cylinder bore, the camera head needs to be small — 5.5mm or less fits most spark plug wells, while some engines need even smaller heads. For general body/rust inspection, a slightly larger head is fine and often gives a sharper image. Cable length should comfortably reach the area you're inspecting with slack to maneuver; a 3-foot cable is enough for engine bay work, while a longer cable (10+ feet) helps for running through door sills or under a vehicle.
Display type: phone app vs. built-in screen
Wi-Fi or USB borescopes that stream to a phone app are the cheapest option and give a bigger, sharper view since you're using your phone's screen, but require your phone in-hand near dirty or wet areas. Units with a small built-in LCD screen cost more but keep your phone clean and free, which matters when working under a car or near fuel and oil.
Features that matter
- Adjustable LED ring light — too bright washes out reflective metal close-up
- Waterproof camera head (commonly IP67) for oil/coolant/fuel exposure
- Image/video recording capability for documenting a pre-purchase inspection
- Flexible vs. semi-rigid cable — flexible routes around bends, semi-rigid holds position better for steady viewing
Never insert a borescope camera into a spark plug hole with the engine running or hot, and always disconnect the ignition coil/plug wire first to avoid electrical shock or camera damage.
Who it suits
Borescopes are genuinely useful for DIYers doing engine diagnostics, used-car pre-purchase inspections, or general home repair beyond cars (plumbing, HVAC). A driver who never does their own inspection work likely won't get regular use out of one and is better off having a mechanic use theirs during a service visit.
Frequently asked questions
What size borescope do I need for spark plug holes?
Can a borescope check for engine carbon buildup?
Is a Wi-Fi borescope as good as one with a screen?
Are borescopes waterproof?
Sources & further reading
- Society of Automotive Engineers — Diagnostic Tool Standards
- Consumer Reports — DIY Car Diagnostic Tools
Figures, prices and policy details were current at the last-updated date above. Automotive pricing, incentives and regulations change frequently — verify time-sensitive details with the linked primary sources. Read our editorial policy and fact-checking standards.
