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AMPBANK · M256 Thermal Imaging Camera for Android, 512x384 High Resolution IR Imager | 25Hz Infrared Camera, 256x192 IR Resolution, ±2% Accuracy, 40mK NETD, Temp Alert, for Maintenance Inspection (not for iOS)
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The AMPBANK M256 is the right pick if you already carry an Android phone and want a thermal imager that lives in a pocket and draws power from the phone. The listing states a 256×192 sensor upscaled to 512×384 by TISR, a -4 to 842 degrees Fahrenheit range, 25Hz refresh and a 30 gram body on a USB-C cable. It is wrong for anyone who needs a standalone screen, a built-in battery, or a device they can hand to a colleague who does not have the app installed.
What the M256 actually is, and what it is not
The M256 is not a camera in the usual sense. It is a sensor head on a USB-C cable. The listing describes a 30 gram (0.07 pound) body that draws 0.35 watts from the host device, with no battery and no display. Everything you see, you see on your phone or PC. That single design decision explains both the appeal and the limits.
Because there is no screen or battery, the unit can be small and can run indefinitely as long as the host has power. The listing includes a 19.7 inch (50 cm) extension cable so the sensor can reach into a vent, an engine bay or behind a panel while the phone stays in your hand. That is a real advantage in tight spaces where a pistol-grip imager will not fit.
What it is not: a standalone instrument. If the phone is flat, the imager is a paperweight. If the app is not installed, the imager shows nothing. If you need to hand the tool to someone else on site, they need the same app and a compatible cable. The listing names the ThermCam app on Google Play and TCView 2.0 PC software, and those are the only routes to an image.
The resolution claim needs reading carefully
The title says 512×384. The first bullet says the sensor is 256×192 and that TISR, a super-resolution algorithm, upscales it to 512×384. Those are not the same thing. A true 512×384 microbolometer has roughly four times the detector elements of a 256×192 sensor. TISR reconstructs detail from a smaller sensor; it does not add detector pixels.
That does not make the M256 a bad tool. A 256×192 sensor is a legitimate resolution for building envelope work, HVAC and electrical inspection, and the upscaling can make the image easier to read on a phone screen. But if you are comparing against a camera that genuinely has a 512×384 detector, compare detector to detector. The explanation of thermal resolution on this site covers why the native array matters more than the output image size.
The listing also states a NETD of under 40mK and an accuracy of plus or minus 3.6 degrees Fahrenheit. NETD describes how small a temperature difference the sensor can resolve; a lower figure is better. 40mK is a workable figure for the tasks named in the listing, such as breaker hot spots and insulation gaps, but it is not a laboratory-grade number and the listing does not claim it is.
The temperature range, refresh rate and what they suit
The stated range is -4 to 842 degrees Fahrenheit (-20 to 450 degrees Celsius). That covers HVAC refrigerant lines, most electrical panels, automotive engine surfaces and building surfaces. It does not cover high-temperature industrial processes, and the listing does not publish an upper range beyond 842 degrees Fahrenheit, so do not assume one.
The 25Hz refresh rate is the more interesting number for a phone-based imager. At 25 frames per second, the image updates fast enough to pan across a wall or an engine bay without the lag that makes low-frame-rate imagers frustrating. The listing does not publish the frame rate of the app preview, only the sensor refresh, so treat 25Hz as the sensor specification.
Accuracy is stated as plus or minus 3.6 degrees Fahrenheit. For finding a hot breaker or a cold draft, that is adequate. For verifying a process temperature to a narrow tolerance, it is not, and the listing does not offer a calibration certificate or a tighter accuracy figure.
The app is half the instrument
The listing names the ThermCam app on Google Play and TCView 2.0 PC software. Features listed include 10 color palettes, smart high and low temperature alerts, picture-in-picture, isotherm, spot, line and area temperature measurement, photo and video capture, 3D edit and data export. Those are the functions that turn a sensor reading into a report.
The catch is that the app is not optional. A standalone thermal camera has its own firmware and its own screen; the M256 depends on a third-party phone and a software layer that the listing does not describe in detail. The listing does not publish the minimum Android version, the app file size, or whether the app works offline. Those are questions to resolve before buying if you plan to use it in a basement or a roof space with no signal.
For report writing, the export and 3D edit features are the ones that matter. A thermal image with no temperature scale and no spot reading is a picture, not evidence. The listing states that spot, line and area measurement are available, which is the minimum for a defensible field report.
Who the M256 fits, and who it does not
This imager fits the technician who already carries an Android phone, wants a thermal tool that lives in a pocket, and works in spaces where a pistol-grip camera will not reach. The 50 cm cable and 30 gram body are the reason. It also fits the DIYer who wants to check insulation, find a draft or look at a breaker panel without buying a standalone camera.
It does not fit the buyer who needs a standalone instrument with its own screen and battery, the buyer who needs to hand the tool to someone without the app, or the buyer who needs a calibrated measurement with a published certificate. The listing does not publish a calibration option, a tripod mount, or a protective case, so those are not available as stated.
If you are comparing phone-based imagers, the guide to Android thermal cameras sets out the trade-offs between sensor size, app quality and cable design. The M256 is one option among several, and the listing does not claim it is the highest resolution or the most sensitive.
The M256 is a pocket sensor, not a standalone camera
Buy the AMPBANK M256 if your phone is already in your hand and your work involves reaching into tight spaces with a thermal sensor. The stated 256×192 sensor, TISR upscaling to 512×384, 25Hz refresh and -4 to 842 degrees Fahrenheit range are adequate for HVAC, electrical and building envelope checks. Do not buy it if you need a screen, a battery, a calibration certificate or a tool you can hand to someone else without installing an app. The listing does not publish those features, and no amount of reading between the lines will add them.
Recommended Tools
Products shown because their documented specifications fit this guide. Price and availability are on Amazon and can change.
Frequently Asked Questions
Is the 512x384 resolution real?
The listing states that the sensor is 256x192 and that TISR upscaling produces a 512x384 image. The detector array is 256x192. The upscaled image is an output, not a larger sensor. Compare detector resolution when comparing against other cameras.
Does it work with iPhone?
The listing describes the M256 as a thermal camera for Android and names the ThermCam app on Google Play. It does not state iPhone compatibility. Do not assume it works with an iPhone without checking the listing.
Does it need a battery or charging?
The listing states it is battery-free and draws 0.35 watts from the host device over USB-C. It runs from your phone or PC. There is no internal battery to charge.
Can I use it without a phone?
No. The listing describes a sensor with no screen and no battery, dependent on the ThermCam app or TCView 2.0 PC software. Without a host device and the software, it produces no image.
Is it accurate enough for professional reporting?
The listing states plus or minus 3.6 degrees Fahrenheit accuracy and under 40mK NETD. That is adequate for finding hot breakers, insulation gaps and moisture patterns. The listing does not publish a calibration certificate, so it is not presented as a calibrated measurement instrument.
What is in the box?
The listing mentions the imager, a 19.7 inch (50 cm) extension cable and access to the ThermCam app and TCView 2.0 software. It does not publish a full box contents list, a case or a tripod mount.
Affiliate disclosure: Akermin earns a commission from qualifying Amazon purchases made through links on this page. Our editorial picks are based on documented specifications and owner feedback, not commissions.
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