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Spark: GOYOJO GW192A · USB-C plug on topSave

GOYOJO GW192A · USB-C plug on top

Thermal camera · everyday

Spark

Made by GOYOJO · model GW192A
A$174

The everyday thermal camera. Plug it into a USB-C phone and see warm and cold as colour — a leak, a draught, an overheating plug.

Works with
✓ iPhone 15 Pro – 17 (USB-C)? iPhone 18 · iPhone 15 — not on the maker’s list yet✓ Android 12+ (USB-C)iPhone 14 or older (Lightning): won’t fit — see Reach Duo
How it works
  1. Plug it into the phone’s USB-C port.
  2. Open the free “THG Start” app.
  3. Point at the wall — purple is cold, yellow is hot.
Specs (from the manufacturer)
Thermal sensor96×96 (shown as 192×192 enhanced)
Refresh rate25 Hz
Field of view50°
Temperature range−20 to 400 °C
Accuracy±2 °C or ±2 %
Size · weight45 × 34 × 11 mm · 19 g
AppTHG Start (iOS, Android)
In the box
  • Thermal camera
  • Quick user guide
  • Protective metal case
  • Retail box
The sensor is 96×96; the app upscales it to 192×192. For sharper detail choose Spark Pro (256×192). The maker doesn’t list iPhone 18 or the base iPhone 15 yet — if you have one, email us before you order.
See how it works

Questions about Spark

Which phones does Spark work with?

USB-C phones: iPhone 15 Pro to iPhone 17 and Android 12 or newer. The base iPhone 15 and iPhone 18 aren't on the maker's list yet — email us before you order. iPhone 14 and older use Lightning and won't fit.

Can a thermal camera see through walls?

No. It reads the temperature of the surface it's pointed at. A pipe, a leak or missing insulation shows up only when it makes that patch of wall warmer or cooler than the rest — which it usually does.

Spark or Spark Pro?

Spark measures 96×96 points (shown as 192×192); Spark Pro measures 256×192, more than five times as many. Spark is enough for close checks like a hot plug or a leaky window frame. For ceilings, whole rooms and small details, choose Spark Pro.

What app does it use?

The free THG Start app for iPhone and Android.

What temperatures can it measure?

−20 to 400 °C (−4 to 752 °F), accurate to ±2 °C or ±2 %.

Can I return it?

Yes, within 30 days of delivery if it's unused and in its original packaging. If it doesn't work with a phone this page says it works with, we refund you in full, including return shipping.

Guides that use Spark

A living room split in two: half a normal photo, half the same scene as a thermal image
Thermal camera basics

How to read a thermal image: colors, reflections and emissivity

Purple here, orange there, a yellow blob you can't explain. What the colors on a thermal camera actually mean, the three things that fool almost everyone, and a five-minute routine for any suspicious spot.

October 23, 2026
A single-storey brick veneer house seen through a thermal camera at night: heat escapes around the windows, the front door and under the eaves
Drafts & insulation

How to find drafts and insulation gaps with a thermal camera

Drafts are hard to find by feel, because moving air spreads out before it reaches you. A thermal camera shows them as streaks on the wall and floor. How to find them in an afternoon, and which fixes are DIY.

October 23, 2026
Spark Pro (GOYOJO GW340) in front of Spark (GOYOJO GW192A)
Buying guide

Spark or Spark Pro? How to choose a phone thermal camera

Both plug into a USB-C phone and use the same app. The difference is how many temperature points they measure, and that decides how far back you can stand and still see the pipe.

October 22, 2026

Buying guides