Marmonix MTV-320 Pro Handheld Thermal Imaging Camera with Wi-Fi

Status: discontinued. The Marmonix MTV-320 Pro is no longer produced. The details below are kept for existing owners and for comparison. For a current model, see the MTV 256 PRO handheld thermal imager, the HTV 340 LPRO or the full thermal cameras range.

The MTV-320 Pro is a pistol-grip 320 × 240 thermal imaging camera with a 640 × 480 visible camera, Wi-Fi and PC analysis software. It measures −10 to +330 °C at ±2 °C or ±2% with 70 mK sensitivity, and tracks the hottest, coldest and centre points plus area zones on a 3.5-inch screen. Every shot is saved as a radiometric TIFF together with its visible and fusion images, so you can re-analyse each pixel on a PC after the survey.

Key features

• 320 × 240 IR detector, 8–14 µm, 70 mK NETD, 6.5 mm lens (34.4° × 25.8°)
• Hot, cold and centre spot tracking plus area temperature zones
• Five image modes: IR, visible, picture-in-picture, outline fusion and overlay fusion
• Nine colour palettes, from iron and rainbow to white hot and black hot
• About 6.6 GB of internal storage (30,000+ images) in radiometric TIFF format
• Wi-Fi link to the PC client; USB Type-C for charging and data
• LED light for dark plant rooms, IP54 housing, 350 g

Where it was used

• Electrical: hot terminals, overloaded breakers and unbalanced phases in panels and switchgear
• HVAC and mechanical: coils, refrigerant lines, motors, bearings and pumps
• Buildings: insulation gaps, thermal bridges, air leaks and moisture patterns
• Research and agriculture: surface temperature mapping where a 320 × 240 image gives enough detail

MTV-320 Pro specifications

Parameter	Value
IR resolution	320 × 240 pixels
Spectral band	8–14 µm
Thermal sensitivity (NETD)	70 mK @ 25 °C
Frame rate (IR)	9 Hz
Lens / field of view	6.5 mm / 34.4° H × 25.8° V
Temperature range	−10 to +330 °C (customisable)
Accuracy	±2 °C or ±2% of reading
Measurement tools	Hottest, coldest and centre spot, plus area zones
Palettes	Tyrian, white hot, black hot, iron, iron hot, rainbow, glory, hottest, coldest
Visible camera	640 × 480, 25 Hz, with LED light
Display	3.5 in, 320 × 240
Image modes	IR, visible, picture-in-picture, outline (edge) fusion, overlay fusion
Storage	Built-in, about 6.6 GB (30,000+ images); IR, visible and fusion images saved together
File format	Radiometric TIFF, full-frame temperature analysis on PC
Connectivity	Wi-Fi to PC software; USB Type-C for charging and data
Battery	Built-in, >4 h at 25 °C; charge with a 5 V ≥2 A USB charger
Operating / storage temp.	−20 to +50 °C / −40 to +70 °C
Protection	IP54
Size / weight	225 × 87 × 101 mm / 350 g

Source: official MTV-320 Pro datasheet (Downloads tab).

Survey workflow with Wi-Fi and PC software

1. Choose a palette and a fusion mode that make the target easy to recognise, such as outline fusion for panels.
2. Use the hot and cold spot markers or an area zone to find the abnormal component, then capture the image.
3. Send the TIFF files to the PC client over Wi-Fi or USB-C.
4. Re-check any pixel’s temperature on the PC and build the maintenance report from the same frames.

MTV-320 Pro vs current Marmonix thermal cameras

	MTV-320 Pro	MTV 256 PRO	MTV-ONE PRO	HTV 340 LPRO
Status	Discontinued	Available	Available	Available
IR resolution	320 × 240	256 × 192	256 × 192	384 × 288
NETD	70 mK	70 mK	<50 mK	—
Temperature range	−10 to +330 °C	−20 to +400 °C	−15 to +600 °C	−20 to +600 °C
Accuracy	±2 °C / ±2%	±2 °C / ±2%	±1 °C / ±1%	—
Format	Pistol grip, 3.5 in screen, Wi-Fi	Handheld, 720p visual camera, 25 Hz	USB-C smartphone add-on (Android)	4.3 in touch screen, manual focus, 8× zoom

For more detail, read the MTV-320 Pro Wi-Fi thermal camera guide, our thermal imaging cameras buyer’s guide and the industrial thermal inspection guide.

MTV-320 Pro: FAQ

<!– wp:rank-math/faq-block {"questions": [{"id": "faq-mtv320-1", "title": "Is the MTV-320 Pro still available?", "content": "No. The MTV-320 Pro is discontinued and this page is kept for reference and existing users. For a current Marmonix handheld, see the MTV 256 PRO or, for higher resolution, the HTV 340 LPRO.”, “visible”: true}, {“id”: “faq-mtv320-2”, “title”: “What is the resolution of the MTV-320 Pro?”, “content”: “The detector is 320 × 240 pixels (76,800 measurement points) in the 8–14 µm band, with 70 mK thermal sensitivity and a 9 Hz frame rate. A 640 × 480 visible camera supports the fusion modes.”, “visible”: true}, {“id”: “faq-mtv320-3”, “title”: “What temperature range and accuracy does it have?”, “content”: “−10 to +330 °C as standard, at ±2 °C or ±2% of reading. The datasheet notes that the range can be customised.”, “visible”: true}, {“id”: “faq-mtv320-4”, “title”: “How does the Wi-Fi and PC software work?”, “content”: “Images transfer to the PC client over Wi-Fi or USB-C. Files are saved as radiometric TIFF, so you can analyse the temperature of every pixel after the survey and build reports from the same frames.”, “visible”: true}, {“id”: “faq-mtv320-5”, “title”: “What image modes does it offer?”, “content”: “Infrared, visible light, picture-in-picture, outline (edge) fusion and overlay fusion, with nine palettes including iron, rainbow, white hot and black hot.”, “visible”: true}, {“id”: “faq-mtv320-6”, “title”: “Which Marmonix thermal camera replaces it?”, “content”: “For a similar handheld at a wider range (−20 to +400 °C), choose the MTV 256 PRO. For 384 × 288 detail up to 600 °C, choose the HTV 340 LPRO. For a pocket option on an Android phone, choose the MTV-ONE PRO.”, “visible”: true}]} –>