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Surveillance is where most private investigators earn their money, and surveillance is won or lost on equipment. A sharp camera, a car you can sit in for nine hours, batteries that do not die at the moment the subject walks out the front door, and notes that hold up when a lawyer reads them. This list is the 20 pieces of equipment we think every private investigator should own, from the camera on your dashboard to the book that teaches you to find people online.
Good equipment helps you win more cases and bill more hours. See what investigators earn in our private investigator salary guide.
Every product pick below is a current, widely bought item on Amazon. We checked each category for models that are selling in high volume every month, then narrowed to the ones that actually fit PI work. Popular is not the same as perfect, so each item tells you what to watch out for.
Quick answer
- Must-haves on day one: a superzoom camera or camcorder, binoculars, extra memory cards, a dash cam, a voice recorder for notes, a weatherproof notebook and a power bank.
- Car kit: window shades, a phone mount, a fast car charger, a red-light headlamp and a portable urinal. Long stakeouts depend on them.
- Know the law first: audio recording, GPS trackers and hidden cameras are where PIs lose licenses. Check your state before you buy.
Top picks at a glance
Canon PowerShot SX740 HS
40x optical zoom · 4K video · pocket size
The best-selling compact superzoom for a reason: it fits in a jacket pocket, shoots 4K and reaches across a parking lot. It is the easiest first surveillance camera to learn.
Watch out for: Small sensor; footage gets noisy after dark.
See current price →Vortex Crossfire HD 10×42
10x magnification · waterproof · lifetime warranty
A top seller in its class. Bright enough for dawn and dusk work, and Vortex replaces them if you break them.
Watch out for: Heavier than compact binoculars; leave them on the seat, not around your neck.
See current price →Vantrue N4 Pro S
3 channels · front, cabin and rear · 4K front
Records the road during mobile surveillance and the cabin if anyone ever accuses you of something. A strong seller with good night performance.
Watch out for: Wiring three cameras takes an afternoon; plan the install.
See current price →Sony ICD-UX570
Built-in USB · 4GB plus microSD · one-touch record
Dictate your observations as they happen instead of writing while driving. Clean audio and simple controls.
Watch out for: Recording other people has consent rules; see the legal section below.
See current price →From the field — Yair Arad
When I ran my PI firm, most of our surveillance work was workers’ compensation fraud and infidelity cases, and I often worked wearing a hidden camera.
Cameras and optics
1. Superzoom camera
Your primary evidence tool. A compact superzoom lets you film a subject from far enough away that they never notice you. The Canon PowerShot SX740 HS gives you 40x optical zoom and 4K video in a camera that disappears in a pocket. If most of your work is long-distance rural surveillance, the Nikon COOLPIX P1100 reaches 125x optical zoom, but it is large, heavy and needs support to hold steady.
Whatever you buy, practise before a paid job. Learn to zoom, focus and hit record without looking down, and set the date and time correctly, because a wrong timestamp gives opposing counsel an easy target.
2. Camcorder
Many investigators still prefer a camcorder for long, continuous video. A camcorder is built to roll for hours, holds steady in your hand and handles zoom smoothly while recording. The Sony HDR-CX405 Handycam is a long-running seller with 30x optical zoom and image stabilization, and it is light enough to hold up for a full approach.
Clients and courts want continuous footage with as few gaps as possible. A camcorder makes that easier than a stills camera that limits clip length.
3. Binoculars
You will spend far more time watching than filming. Binoculars let you confirm the subject, read a situation and decide whether to start recording without burning battery. A 10×42 pair is the standard for surveillance: enough magnification to identify a face across a lot, and wide enough lenses to stay bright at dusk. The Vortex Crossfire HD 10×42 is a strong seller and carries a lifetime warranty.
4. Window mount for your camera
Holding a camera at full zoom for twenty minutes shakes, and shaky footage is weak footage. A suction-cup or window clamp mount holds the camera against the glass so your hands are free and the image stays steady. NEEWER suction-cup mounts and SVBONY car window mounts are both popular and inexpensive.
5. Extra memory cards
A full card is the most avoidable way to miss the shot. Carry at least two spare high-speed cards and swap them before each job. SanDisk Extreme SD cards are among the best-selling memory cards on Amazon. Buy the speed class your camera needs for 4K, keep the originals untouched, and work only from copies.
6. Dash cam
A dash cam records the road during mobile surveillance and gives you a timestamped record of where you were and when. A cabin-facing camera also protects you if a subject or a police officer later claims something happened that did not. The Vantrue N4 Pro S records front, cabin and rear, and it sells strongly.
Check your state rules on audio recording inside the car and on windshield mounting before you install.
7. Body-worn camera
On foot, in a store or at a public event, a body-worn camera keeps recording while your hands are busy. Budget body cameras such as the BOBLOV KJ25 sell well and run for many hours. Covert cameras built into buttons, glasses or bags exist too, but they come with the strictest legal rules on this list.
Video in a public place is generally lawful. Audio is a different question, and hidden recording in private spaces such as restrooms or homes is illegal. Know the line before you clip one on.
See current price → Read our body camera guide
The point of all of this gear is simple: the client pays for the footage, not for the hours you sat in the car. Every item below exists so that when the moment happens, you get it.
Audio, notes and data
8. Digital voice recorder
Writing notes while you drive or film is how you miss things. Dictate your observations instead: time, location, what the subject did. You can turn those notes into a clean written report later. The Sony ICD-UX570 is simple, records clearly and plugs straight into a laptop through its built-in USB connector.
Recording your own voice is always fine. Recording other people talking is regulated; read the legal section before you record a conversation.
See current price → Voice recorders and AI note-takers compared
9. Weatherproof notebook and pens
Your surveillance log is evidence. Courts and insurance adjusters expect contemporaneous notes: written at the time, with times, places and descriptions. Rite in the Rain notebooks are among the best-selling field notebooks on Amazon and keep working in rain, snow and a sweaty car. Pair one with a pen that writes upside down or in the cold.
10. Laptop privacy screen
A large part of modern PI work is online: database searches, social media checks and reports. A privacy filter stops anyone beside you in a coffee shop or the next car from reading the screen. It is cheap protection for confidential client information.
Your surveillance vehicle kit
Your car is your office, your blind and sometimes your bed. These items make it possible to sit on a subject for a full shift without being spotted, losing power or having to leave.
11. Magnetic window shades
Shades on the rear side windows hide movement in the back seat, where many investigators sit to film so the driver seat looks empty. Magnetic shades go on and off in seconds. ZATOOTO magnetic window shades are a high-volume seller. Keep the front windows clear; dark front windows draw attention and are illegal in many states.
12. Phone mount
Your phone is your map, your clock and your link to the client. A mount keeps it in sight and hands-free during mobile surveillance. The iOttie Easy One Touch is one of the best-selling phone mounts on Amazon.
13. Fast car charger
Cameras, phones, recorders and the dash cam all draw power. A multi-port fast charger keeps everything running from the car. UGREEN multi-port USB-C car chargers sell in high volume and can charge a laptop as well as a phone.
14. Power bank
You cannot always run the engine. Idling for hours wastes fuel, draws attention and is banned in some places. A 20,000mAh power bank recharges a phone several times and keeps a camera alive through a long sit. Anker is the best-known brand in this category.
15. Portable urinal
Nobody talks about it, every investigator owns one. If you leave the car, you can lose the subject. Spill-proof portable urinals are among the highest-volume items in this whole list, which tells you how many people sit in cars for a living.
16. Red-light headlamp
You will need light inside the car at night to change a card, find a lens cap or write a note. White light announces that someone is in the car. A headlamp with a red mode lets you see without lighting up the cabin.
See current price → Read our flashlight guide
17. Two-way radios
On team surveillance, radios let investigators hand the subject off between cars without the delay of phone calls. License-free FRS radios such as the Motorola Talkabout T470 sell well and work for short-range team work. Real-world range is far shorter than the box claims, especially in cities.
See current price → Read our radio guide
Specialty and training
18. Hidden camera and bug detector
Some clients hire investigators to check a home, car or office for hidden cameras and trackers. A consumer RF and lens detector is a useful first screen and a good way to learn. Be honest with clients about its limits: it is not a professional technical surveillance countermeasures (TSCM) sweep.
19. OSINT Techniques by Michael Bazzell
Open-source intelligence is now a core PI skill: finding people, verifying identities and building a timeline from public records and social media. Michael Bazzell’s OSINT Techniques is the standard reference and is updated in new editions as tools change. Buy the newest edition; online tools change fast.
20. A plain camera backpack
You need to carry cameras, batteries and cards on foot without looking like a photographer. A plain, padded camera backpack in a neutral colour protects the gear and blends in. MOSISO and K&F Concept camera backpacks are both strong sellers.
Sample loadouts by case type
You do not need all 20 items on every job. Here is what we would bring for the most common kinds of PI work:
| Case type | Core loadout | Focus |
|---|---|---|
| Workers’ comp and insurance fraud | Superzoom camera or camcorder, window mount, spare cards, binoculars, dash cam, window shades, power bank, voice recorder, portable urinal | Long sits and clear, continuous video of physical activity. |
| Domestic and infidelity | Compact camera, body-worn camera, binoculars, dash cam, phone mount, car charger, notebook | Mobile surveillance and public places; stay strictly within recording laws. |
| Team surveillance | Two-way radios, phone mounts, dash cams, camcorders, power banks | Smooth hand-offs between cars. |
| Background checks and OSINT | Laptop with privacy screen, OSINT Techniques, notebook, voice recorder for interviews (with consent) | Accurate records and protecting client data. |
| Bug sweeps for clients | Hidden camera and RF detector, red-light headlamp, notebook | Honest screening; refer full TSCM work to specialists. |
Legal limits that decide what you can use
Owning the gear is legal almost everywhere. Using it is where investigators get into trouble. These are the areas that cost PIs their licenses most often:
- Audio recording. Federal law allows recording a conversation if one party consents (18 U.S.C. § 2511). A minority of states, including California, Florida, Pennsylvania and Washington, require every party’s consent. Recording a conversation you are not part of is wiretapping almost everywhere.
- GPS trackers. Putting a tracker on a car you do not own or have permission to track is illegal in many states, and state rules differ widely. Do not buy one for a case until you have checked your state law and your licensing rules.
- Hidden cameras. Filming in public places, where nobody has a reasonable expectation of privacy, is generally lawful. Hidden video in bathrooms, bedrooms or other private spaces is a crime.
- Trespass and pretexting. Your camera does not give you a right to enter private property, and many states limit pretexting to obtain records.
- Window tint and windshield mounts. Dark front windows and devices blocking the windshield can get you pulled over in the middle of a job.
Your licensing board is the final word. Our PI license requirements by state pages link to each state’s regulator.
What to skip
- “Spy” gadgets sold as listening devices. If its main selling point is hearing people who do not know they are being recorded, it is a legal problem waiting to happen.
- Night-vision gear before you need it. Cheap digital night-vision monoculars are fun, but most urban surveillance happens under streetlights. Buy one when a case needs it.
- Expensive interchangeable-lens cameras on day one. A good superzoom covers most jobs. Upgrade when you know what you are missing.
How to keep your evidence usable
- Set the date and time on every device before every job.
- Copy footage to two places the same day and keep the original card untouched.
- Keep your written log and your video consistent: times in your notes should match the timestamps on the clips.
- Write the report while it is fresh. Our daily activity report guide shows the same discipline guards use.
Frequently asked questions
What equipment do private investigators use?
The core kit is a camera or camcorder with strong zoom, binoculars, spare memory cards, a dash cam, a voice recorder for notes, a weatherproof notebook, power for long sits and a laptop for online research.
What is the best camera for a private investigator?
For most new investigators, a compact superzoom such as the Canon PowerShot SX740 HS is the best start. It is small, shoots 4K and has 40x zoom. A camcorder such as the Sony HDR-CX405 is better for long continuous video.
Can a private investigator use a GPS tracker?
It depends on the state and on who owns the vehicle. Many states make it illegal to track a car without the owner’s consent. Check your state law and licensing rules before using one.
Can private investigators record conversations?
Federal law allows recording when one party consents, but a minority of states require every party’s consent. A PI cannot record a conversation they are not part of.
Do private investigators have to buy their own equipment?
Independent investigators buy their own. Employees of agencies are often issued cameras and some gear, but most still buy their own small items such as notebooks, mounts and chargers.
Related guides
- How to become a private investigator
- Private investigator license requirements by state (A–Z)
- Security guard equipment list: 20 essentials
- Security careers: every path explained
- Security technology and AI tools
Sources
- U.S. Bureau of Labor Statistics — Private Detectives and Investigators
- 18 U.S. Code § 2511 — Interception and disclosure of communications (Cornell LII)
Verified against official sources in October 2026. Amazon sales signals checked October 2026.
Legal disclaimer: This page is for general information and education only. It is not legal advice, and reading it does not create an attorney-client relationship. Security Dogma is not a law firm. Laws, licensing rules and court decisions vary by state and change often, and what is written here may not match your situation or be current when you read it. Before you act on anything here, check the official rules from your state licensing agency, follow your employer’s and client site’s policies, and talk to a licensed attorney in your state for legal questions. See our Terms and Conditions and how facts are checked in our Editorial Policy.