The best thermal camera smartphone accessory I've tested is 23% off for Black Friday

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Hand holding InfiRay P2 Pro

The InfiRay P2 Pro.

Adrian Kingsley-Hughes/ZDNET

I'm a big fan of Android smartphones with built-in thermal cameras, such as the awesome Ulefone Power Armor 18T.

I also understand that some people just don't want to have to swap out their smartphones to get access to this useful superpower.

Also: The best Black Friday deals: Live updates

If you don't want to have to buy a new smartphone, then this is the tool for you. Right now, you can get it for $70 off if you're a Prime member: InfiRay P2 Pro.

InfiRay P2 Pro tech specs

256x192 IR resolution256x192 IR resolution-20°C to 550°C ± 2°C temperature rangeSmall design: 27mm × 18mm × 9.8mm and weighs 9gBattery-free designSupport Android 9.0 and aboveUSB-C interface

The InfiRay P2 Pro consists of a tiny thermal camera and a magnetic snap-on macro lens that allows the camera to be brought super close to the item being examined.

Also: This is the best car diagnostic tool I've ever used, and it's only $54 with this Black Friday deal

The camera is indeed tiny. Measuring 27 × 18 × 9.8mm and weighing in at a minute 9 grams, it's smaller and lighter than a charging cable.

The InfiRay P2 Pro in hand

The InfiRay P2 Pro is tiny.

Adrian Kingsley-Hughes/ZDNET

Setting up the P2 Pro is easy -- download and install the P2 Pro app from the Google Play Store, fire up the app, pop the camera into the USB-C port, and away you go.

Hand holding Android smartphone with InfiRay P2 Pro

Here is the InfiRay P2 Pro fitted onto an Android smartphone.

Adrian Kingsley-Hughes/ZDNET

If your Android smartphone is the ruggedized type, you might have problems fitting the camera and need to get your hands on a USB-C extender.

Also: The best travel gadgets of 2024

Then you can start exploring your environment.

InfiRay P2 Pro selfie of a man

Here's an InfiRay P2 Pro selfie.

Adrian Kingsley-Hughes/ZDNET

A feature of the P2 Pro app I really like is that along with crosshairs at the center of the image are two more that pick up the highest and lowest temperature in the shot.

Thermal information on the P2 Pro app

The P2 Pro app gives you a raft of thermal information.

Adrian Kingsley-Hughes/ZDNET

Then there is the macro lens.

Closeup of hand holding the magnetic macro lens for the P2 Pro

Here's the magnetic macro lens for the P2 Pro.

Adrian Kingsley-Hughes/ZDNET

Popping the macro lens onto the front of the camera lets you get up close and personal with what you're looking at, giving you better resolving power to really home in.

Using the macro lens to home in on a circuit board

Let's get up close with the macro lens.

Adrian Kingsley-Hughes/ZDNET
Closeup of information about thermal image

Here's a closeup thermal image.

Adrian Kingsley-Hughes/ZDNET

The software offers a lot of customization options without being packed with unnecessary features.

The P2 Pro software features

The P2 Pro software is well thought out.

Adrian Kingsley-Hughes/ZDNET

This thermal camera is awesome, especially considering the price.

Not sure what you can do with one? Here are just a few things you can do with a thermal camera:

Find overheating electrical components (faulty components usually run hotter).Diagnose all sorts of HVAC problems, from windows that leak heat to radiators that aren't warming up properly to AC units that aren't cooling.Find dangerously overheating rechargeable batteries.Find radiator pipes underneath floorboards.Find overheating power cables.Find problems with cooling systems on desktop and laptop systems.Spot binding brakes on cars.

My tip for learning to use a thermal camera is to use it to look at things when they aren't faulty -- your radiators, car brakes, electrical stuff, anything -- and that way you get to know how things should look, so you can tell when things aren't working right.

Also: I recommend this $50 anti-spy camera finder and bug detector to anyone traveling

I find the thermal camera so useful that I turn to it without thinking about it. Just now, I wanted to know if an electrical appliance was getting power. Instead of reaching for a multimeter, I used my thermal camera to see if anything was warming up on the inside. Once I saw components heating up, that eliminated a load of possible problems.

I've been testing a number of thermal cameras -- both cameras that are standalone and cameras that attach to smartphones -- and the InfiRay P2 Pro is the best. It's small, the macro lens makes it super flexible, it's fast and accurate, and it doesn't need to be charged up separately.

This is a fantastic addition to any repair toolkit, and if you're an Amazon Prime member, you can get $70 off the list price of the iPhone version as well.

What are the best Black Friday 2024 deals?

ZDNET's experts have been searching through Black Friday sales live now to find the best discounts by category. 

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