Equipment For Private Investigators

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The Complete Guide to Private Investigator Gear (2026 Guide)

So, you want to be a private investigator?

That's awesome — one of the most fun and rewarding careers out there.

We work with a lot of PIs here at GPS Tracker Shop (they buy a lot of stuff from us), so we know a thing or two about the gear they need.

We've put together this guide on private investigator gear based on our 15+ years of experience helping private investigators catch cheating spouses, expose corporate greed, and uncover fraud.

We'll cover the gadgets you need, which types of equipment to buy, which stuff you don't need, and some tips on evaluating gear before you buy it.

Ready? Let's go.

First, What Gear Does a Private Investigator Need?

If you want to become a private investigator, you'll need specialized gear to handle various tasks effectively. Keep in mind you could be following someone in a car in the morning, then staking out their house at night (legally, please).

You need to choose each tool carefully based on the demands of different cases. Staying discreet and adaptable, all while keeping under the radar, is the job.

There are a few things you'll always be doing, though, so it's worth having equipment for each of these situations:

Which Equipment Do You NOT Need (or Shouldn't Use)?

Here's a tip for wannabe private investigators: never try to act like law enforcement.

No police badges or sirens — that's going to get you arrested.

Don't blow your budget on stuff you don't need, like body armor, unless you're in a rough area or think things might get dicey.

And one last thing: whatever equipment you use, use it in a legal way.

Don't track someone's location by putting a GPS tracker on their car without their consent, for example — that could land you in prison.

Always double-check the laws in your area so you're using your tools the right way.

The 5 Best Surveillance Gadgets For Private Investigators

1. GPS Car Tracker – Best Spy Product For PIs

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A GPS car tracker should be the first thing you buy as a private investigator.

These days, people hire PIs mostly to track their cheating spouses. Ain't much, but it's honest work.

Grab yourself a location-tracking gadget like the SpaceHawk GPS tracker, which gives you real-time location updates, movement alerts, and even a live link to share with law enforcement if you ever need it.

Attach it to your target's vehicle (we recommend putting it under the car) and install the app on your phone.

That's it, you're done.

Just make sure to check the laws in your local area, and don't do anything illegal. If it's against the law to place the tracker in your state, you're taking a huge risk doing so.

2. Listening Devices – Best Audio Spy Equipment

64GB Digital Voice Recorder
High-quality sound with sensitive microphones. Voice-activated recording for efficient space use. Easy file transfer; MP3/WAV compatible. Doubles as an MP3 music player.

★★★★☆ 4/5

Buy on Amazon

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Voice-activated listening devices listen in on their surroundings and record audio for you to listen to later.

Chances are you'll need one in your day-to-day work, especially if you're working with couples or in the corporate world.

Voice-activated recorders are best for:

These gadgets don't need much power or a lot of features, so they should be pretty cheap. Just make sure to get one with good sound quality, plenty of storage, and easy file transfer — the one we recommended above checks all three boxes.

3. Bug Detector

A bug detector is a must-have tool for any private investigator.

With a bug detector, you can sweep for hidden microphones or cameras, making sure nobody is keeping tabs on you.

They're great for dealing with high-stakes cases like cheating spouses or corporate espionage — cases where the other side is probably watching you as much as you're watching them.

Using one also gives you an edge in protecting your own investigations from being compromised.

We recommend getting a bug detector that's easy to use and has a lot of positive reviews on Amazon. Cheap bug sweepers tend to throw false positives, sending you on a ghost hunt for hours — get something reliable.

4. Hidden Spy Cameras

Next up, you're going to need a hidden spy camera to collect evidence in certain situations. Say a scorned wife comes to you and wants you to track her cheating husband.

Time to catch that cheating dog.

The only problem is he's meeting his side-girl in a public park. A GPS location tracking device won't do you any good there, since there's nothing wrong with being in a public park — you need more evidence than that.

You could hide a camera in the park, or wherever the cheating is taking place, and gather real, solid evidence of his infidelity that can be used in divorce proceedings.

The most important features to look for in a hidden spy camera are size, video quality, and wi-fi connection. The video needs to be crisp so the evidence stands up in court (or at least satisfies your client's suspicions), and you'll want wi-fi so you can access the footage from your phone or laptop.

5. A Word On Phone Monitoring Software

You'll see phone spy software marketed heavily to PIs, promising to log everything happening on a target's phone — calls, texts, app usage, location, all of it.

We're not going to recommend it, and we're not going to walk through how to get it onto someone else's phone.

Installing monitoring software on a phone you don't own, without the owner's knowledge or consent, is illegal in nearly every U.S. state — it falls under wiretapping and computer-intrusion laws, not just privacy guidelines, and it's the same category of app used in domestic-abuse and stalking cases. That risk applies whether the target is a stranger, a business contact, or a spouse.

If a client asks you to monitor a phone, the legal path is consent: company-owned devices with a signed monitoring policy, or a personal device the owner has agreed to hand over. Anything past that belongs to law enforcement with a warrant, not a PI with an app.

Be Your Own Private Detective

Being your own private detective is a lot more cost-effective than hiring one. These gadgets usually cost a fraction of a PI's average daily rate.

Hidden devices for tracking vehicles usually cost less than $100 and come with free technical support, so there's someone available to help if you need it.

Here's why we recommend going it alone:

That said, keep the legal considerations in mind:

• Privacy laws: understand and respect privacy laws in your area.
• Consent: in some regions, recording audio requires the consent of the person being recorded, and tracking location without consent might be illegal.
• Ethical use: use surveillance equipment ethically and responsibly.

Equipment For Private Investigators – FAQs