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Straight-on view · Illustration
A 27-inch 4k IPS monitor aimed at colour-critical work, with a 144Hz panel and a 90 W USB-C hub.
HannahRev Test Bench · demo dataset · Reviewed · Updated
Demo data. This product and brand are fictional. Scores, measurements and notes on this page are illustrative values used to build the HannahRev review template — they are not laboratory results.
The Altairon A27U Pro is a 27-inch 4k IPS monitor built for photo and video work. It combines a factory-calibrated panel with a 144Hz refresh rate, a fully adjustable stand and a USB-C hub that delivers 90 W to a laptop.
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Every score is calculated from the measurements further down this page. Expand a score to see its ingredients.
Overall
Mean of the four usage scores
Methodology v0.1-demoWeighted from
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Demo rubric. Each scored metric is mapped linearly onto 0–10 between a 'worst' and a 'best' anchor and clamped. A test group score is the weighted mean of its metric scores. A usage score is the weighted mean of its group scores; groups marked not applicable are dropped and the remaining weights are re-normalised. The overall score is the mean of the four usage scores. Anchors and weights are placeholders until HannahRev publishes its production methodology.
An excellent work monitor. Colour accuracy and text sharpness are the highlights, and the stand and USB-C hub make it easy to live with. HDR is not its strength because the backlight cannot dim locally.
Key measurements against the alternatives we recommend considering.
Compared with the demo alternatives, the A27U Pro trades gaming speed and HDR impact for colour accuracy and ergonomics.
| Metric | Altairon A27U Pro This product | |||
|---|---|---|---|---|
| Overall score | 7.4 | 8.1 | 7.8 | 5.4 |
| PC Gaming | 6.1 | 8.6 | 8.4 | 5.9 |
| Console Gaming | 5.9 | 8.4 | 8.5 | 4.5 |
| Office | 8.8 | 7.3 | 6.5 | 5.6 |
| Editing | 8.9 | 8.1 | 7.7 | 5.4 |
| Screen size | 27.0 in | 31.5 in | 26.5 in | 27.0 in |
| Resolution | 3,840 × 2,160 | 3,840 × 2,160 | 2,560 × 1,440 | 2,560 × 1,440 |
| Panel type | IPS | WOLED | QD-OLED | IPS |
| Refresh rate | 144 Hz | 240 Hz | 240 Hz | 180 Hz |
| Response time (max refresh) | 5.8 ms | 0.5 ms | 0.4 ms | 6.9 ms |
| Input lag (max refresh) | 4.1 ms | 1.9 ms | 1.6 ms | 3.2 ms |
| Native contrast | 1,250 : 1 | ∞ : 1 | ∞ : 1 | 1,050 : 1 |
| SDR brightness (real scene) | 410 cd/m² | 245 cd/m² | 265 cd/m² | 330 cd/m² |
| HDR brightness (real scene) | 420 cd/m² | 520 cd/m² | 455 cd/m² | 335 cd/m² |
| DCI-P3 coverage | 97.1% | 96.5% | 98.2% | 80.5% |
| Colour accuracy (dE) | 0.70 | 1.60 | 1.20 | 2.40 |
| Text clarity | 9.2 / 10 | 6.5 / 10 | 7.0 / 10 | 7.8 / 10 |
| Coating | Matte (anti-glare) | Matte (anti-glare) | Glossy | Matte (anti-glare) |
| USB-C charging | 90 W | 90 W | 65 W | Not applicable |
Altairon A27U Pro
Kestrova K27F-180
The A27U Pro is the stronger all-rounder for work, with better colour, sharper text and a full stand. The K27F-180 is faster for competitive play at a lower cost.
Altairon A27U Pro
Vireon V32-W240
Both are 4k. The V32-W240 wins for games and HDR; the A27U Pro is better for colour-critical editing and bright offices.
How the monitor is built, how far the stand adjusts and what ships in the box.
| Metric | Result |
|---|---|
| Curved Screen | No |
| Curve Radius | Not applicableFlat panel |
| Finish | Brushed aluminium stand, matte white rear |
A description of the chassis, finish and silhouette. Not scored — style is a matter of taste.
Structured visual inspection (v0.1-demo): A fixed checklist completed by the reviewer under standard room lighting. Assessed scores use the same 0–10 anchors for every product.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result | Metric score |
|---|---|---|
| Build Quality Assessment | 8.8 / 10 | 8.8 |
An assessed score for rigidity, panel flex, stand wobble and material quality, recorded on a fixed 0–10 checklist.
Structured visual inspection (v0.1-demo): A fixed checklist completed by the reviewer under standard room lighting. Assessed scores use the same 0–10 anchors for every product.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result | Metric score |
|---|---|---|
| Height Adjustment | 15.0 cm | 10.0 |
| Tilt RangeScored on the total span of the range. | -5° to 21° | 8.7 |
| Swivel RangeScored on the total span of the range. | -30° to 30° | 10.0 |
| Portrait Rotation | Yes | 10.0 |
The best stand in this demo set, with a long height range and full portrait rotation.
How far the stock stand moves. Height range carries the most weight because it matters most for posture at a desk.
Stand adjustment measurement (v0.1-demo): Ranges measured with a steel rule and digital inclinometer from the stand's neutral position.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result |
|---|---|
| Base Width | 24.0 cm |
| Base Depth | 19.5 cm |
| Weight (With Stand) | 7.1 kg |
| VESA Mount | 100 × 100 |
Footprint and weight of the stand, which decide how much desk depth the monitor consumes.
Stand adjustment measurement (v0.1-demo): Ranges measured with a steel rule and digital inclinometer from the stand's neutral position.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result |
|---|---|
| Screen Size | 27.0 in |
| Aspect Ratio | 16:9 |
| Coating | Matte (anti-glare) |
Diagonal size, aspect ratio and screen coating.
Structured visual inspection (v0.1-demo): A fixed checklist completed by the reviewer under standard room lighting. Assessed scores use the same 0–10 anchors for every product.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result |
|---|---|
| Control Type | Four buttons and a joystick on the rear right |
The physical controls used to reach the on-screen menu.
Structured visual inspection (v0.1-demo): A fixed checklist completed by the reviewer under standard room lighting. Assessed scores use the same 0–10 anchors for every product.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result |
|---|---|
| Included | DisplayPort cable, USB-C cable (100 W rated), HDMI cable, Factory calibration report, Power cable |
Cables and accessories included with the retail unit.
Structured visual inspection (v0.1-demo): A fixed checklist completed by the reviewer under standard room lighting. Assessed scores use the same 0–10 anchors for every product.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
Contrast, brightness, uniformity and colour — the measurements that decide how an image actually looks.
| Metric | Result | Metric score |
|---|---|---|
| Native Contrast | 1,250 : 1 | 1.7 |
Ratio between the brightest white and the deepest black the panel can show at the same time. Higher contrast produces deeper blacks in dark rooms.
Contrast measurement (v0.1-demo): Checkerboard pattern measured with a colorimeter in a dark room, local dimming off unless stated.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result | Metric score |
|---|---|---|
| Local Dimming | No | |
| Dimming Zones | Not applicableNo local dimming | |
| Blooming Control Assessment | 0.0 / 10 | 0.0 |
Whether the backlight can dim zones independently, and how well it avoids blooming. Self-emissive panels control every pixel directly, so this test does not apply to them.
Contrast measurement (v0.1-demo): Checkerboard pattern measured with a colorimeter in a dark room, local dimming off unless stated.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result | Metric score |
|---|---|---|
| Real Scene Peak | 410 cd/m² | 8.9 |
| Sustained 100% Window | 395 cd/m² | 9.8 |
Luminance with standard (non-HDR) content. Real-scene peak reflects typical desktop use; the sustained full-screen value matters for bright rooms.
Luminance measurement (v0.1-demo): White windows of fixed size measured at the centre of the screen after a warm-up period, brightest calibrated picture mode.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result | Metric score |
|---|---|---|
| Real Scene Peak | 420 cd/m² | 2.8 |
Peak luminance with a white window covering the given share of the screen.
Peak luminance in HDR mode across window sizes. Small highlights can get much brighter than a full white screen on most panels.
Luminance measurement (v0.1-demo): White windows of fixed size measured at the centre of the screen after a warm-up period, brightest calibrated picture mode.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result | Metric score |
|---|---|---|
| 50% Std. Dev. | 2.40% | 8.6 |
| 100.5 | 96.7 | 97.5 | 101.5 | 99.0 |
| 100.9 | 98.1 | 98.0 | 99.9 | 96.9 |
| 100.3 | 98.6 | 100.0 | 100.3 | 101.3 |
| 101.2 | 99.7 | 99.7 | 100.5 | 101.6 |
| 98.5 | 100.1 | 99.1 | 100.2 | 98.0 |
Blue zones are darker than the centre, amber zones brighter. Values in %.
How evenly a 50% gray field is reproduced across the screen. Lower deviation means fewer dirty-screen patches during panning shots.
Uniformity measurement (v0.1-demo): A 5 × 5 grid of luminance readings across a uniform test field; the result is the standard deviation from the mean.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result | Metric score |
|---|---|---|
| Native Std. Dev. | 2.90% | 6.8 |
How even a near-black image looks in a dark room. Backlight bleed and clouding raise this value.
Uniformity measurement (v0.1-demo): A 5 × 5 grid of luminance readings across a uniform test field; the result is the standard deviation from the mean.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result | Metric score |
|---|---|---|
| White Balance dE | 0.80 | 9.5 |
| Color dE | 0.70 | 9.6 |
| Color Temperature | 6,520 K |
Exceptionally accurate in the sRGB and DCI-P3 presets. The included calibration report matched our demo readings closely.
Out-of-the-box accuracy in the most accurate preset, before any calibration. Delta E values under 2 are generally not visible to the eye.
Colour measurement (v0.1-demo): Spectro-radiometer readings of a fixed patch set in the most accurate factory preset, compared against the target colour space.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result | Metric score |
|---|---|---|
| sRGB xy | 100.0% | 10.0 |
| DCI-P3 xy | 97.1% | 9.3 |
| Adobe RGB xy | 98.6% | 9.9 |
Coverage of standard colour spaces. sRGB matters for web work; DCI-P3 and Adobe RGB matter for video and print.
Colour measurement (v0.1-demo): Spectro-radiometer readings of a fixed patch set in the most accurate factory preset, compared against the target colour space.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result | Metric score |
|---|---|---|
| 1,000 cd/m² DCI-P3 ITP | 38.0% | 1.2 |
How much of the DCI-P3 colour volume the panel can reproduce at high luminance, which decides how saturated bright HDR highlights look.
Colour measurement (v0.1-demo): Spectro-radiometer readings of a fixed patch set in the most accurate factory preset, compared against the target colour space.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result | Metric score |
|---|---|---|
| Color Washout | 38° | 4.7 |
| Brightness Loss | 45° | 5.5 |
The off-axis angle at which colour washes out or brightness drops noticeably. Wide angles keep the edges of large screens consistent.
Viewing angle measurement (v0.1-demo): Readings taken at 5° increments off-axis until the change crosses a fixed visibility threshold.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result | Metric score |
|---|---|---|
| Subpixel Layout | RGB stripe | |
| Text Clarity Assessment | 9.2 / 10 | 9.2 |
An assessed score for fringing and sharpness of small text, which depends heavily on the subpixel layout.
Structured visual inspection (v0.1-demo): A fixed checklist completed by the reviewer under standard room lighting. Assessed scores use the same 0–10 anchors for every product.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result | Metric score |
|---|---|---|
| Total Reflected Light | 6.4% | 4.5 |
| Direct Reflections | 0.90% | 9.1 |
Share of ambient light the screen reflects back at the viewer. Lower is better in bright rooms.
Reflection measurement (v0.1-demo): Screen off, lit by a calibrated diffuse source; reflected luminance is expressed as a share of the incident light.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result | Metric score |
|---|---|---|
| Banding Assessment | 9.0 / 10 | 9.0 |
| Color Depth | 10-bit (8-bit + FRC) |
An assessed score for banding in smooth colour gradients.
Structured visual inspection (v0.1-demo): A fixed checklist completed by the reviewer under standard room lighting. Assessed scores use the same 0–10 anchors for every product.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result |
|---|---|
| Panel Type | IPS |
| Backlight | Edge-lit LED |
The panel and backlight type. Useful context for the measurements above; not scored on its own.
Structured visual inspection (v0.1-demo): A fixed checklist completed by the reviewer under standard room lighting. Assessed scores use the same 0–10 anchors for every product.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
How cleanly the panel handles movement: refresh rate, variable refresh and pixel transition speed.
| Metric | Result | Metric score |
|---|---|---|
| Native Refresh Rate | 144 Hz | 3.8 |
| Overclocked Refresh Rate | Not applicableNo overclock mode |
Maximum native refresh rate. Higher refresh rates reduce persistence blur and make input feel more immediate.
Motion feature verification (v0.1-demo): Refresh, VRR and flicker behaviour verified with a photodiode and a signal generator.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result | Metric score |
|---|---|---|
| VRR Support | Yes | 10.0 |
| Low Framerate Compensation | Yes | 10.0 |
| VRR Range | 48 Hz to 144 Hz | |
| Formats | FreeSync Premium, G-SYNC Compatible |
Support for matching the refresh rate to the frame rate, which removes tearing without the latency of V-Sync.
Motion feature verification (v0.1-demo): Refresh, VRR and flicker behaviour verified with a photodiode and a signal generator.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result | Metric score |
|---|---|---|
| Total Response Time | 5.8 ms | 5.4 |
| Overshoot Error | 3.1% | 8.5 |
Average time for pixels to finish transitions at the maximum refresh rate, with the recommended overdrive setting.
Response time measurement (v0.1-demo): Average of a fixed grid of gray-to-gray transitions captured with a photodiode and oscilloscope.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result | Metric score |
|---|---|---|
| Total Response Time | 9.6 ms | 5.5 |
| Overshoot Error | 0.8% | 9.6 |
The same transition test at 60Hz, which matters for consoles and older content that cannot run at high frame rates.
Response time measurement (v0.1-demo): Average of a fixed grid of gray-to-gray transitions captured with a photodiode and oscilloscope.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result | Metric score |
|---|---|---|
| Backlight Strobing | Yes | 10.0 |
| Maximum Strobing Frequency | 144 Hz |
An optional mode that flashes the image to reduce perceived blur, at the cost of brightness.
Motion feature verification (v0.1-demo): Refresh, VRR and flicker behaviour verified with a photodiode and a signal generator.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result | Metric score |
|---|---|---|
| Flicker-Free | Yes | 10.0 |
| PWM Frequency | Not applicableFlicker-free |
Whether brightness is controlled with pulse-width modulation. A flicker-free backlight is easier on sensitive viewers.
Motion feature verification (v0.1-demo): Refresh, VRR and flicker behaviour verified with a photodiode and a signal generator.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
Latency, resolution, console support and physical connectivity.
| Metric | Result | Metric score |
|---|---|---|
| Native Resolution @ Max Hz | 4.1 ms | 7.8 |
| Native Resolution @ 60Hz | 12.4 ms | 6.3 |
Delay between a signal arriving at the input and the image changing on screen, measured with the fastest picture mode.
Input lag measurement (v0.1-demo): Time from signal output to a change at the centre of the screen, averaged over repeated captures.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result | Metric score |
|---|---|---|
| Native Resolution | 3,840 × 2,160 | |
| Pixel Density | 163 ppi | 9.8 |
Native resolution and the resulting pixel density at this screen size.
Structured visual inspection (v0.1-demo): A fixed checklist completed by the reviewer under standard room lighting. Assessed scores use the same 0–10 anchors for every product.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result | Metric score |
|---|---|---|
| PS5 4k @ 120Hz | Yes | 10.0 |
| PS5 1440p @ 120Hz | Yes | 10.0 |
| Xbox Series X|S 4k @ 120Hz | Yes | 10.0 |
| Console HDR | Yes | 10.0 |
Which high-frame-rate and HDR signals current consoles can send to the monitor.
Console signal verification (v0.1-demo): Each console output mode is selected and confirmed through the console's own video information screen.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result |
|---|---|
| HDMI Ports | 2 |
| HDMI Version | 2.1 |
| DisplayPort Ports | 1 |
| DisplayPort Version | 1.4 |
| USB-C DisplayPort Alt Mode | Yes |
| USB-C Power Delivery | 90 W |
Video inputs available on the rear panel.
Structured visual inspection (v0.1-demo): A fixed checklist completed by the reviewer under standard room lighting. Assessed scores use the same 0–10 anchors for every product.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
| Metric | Result |
|---|---|
| USB-A Ports | 4 |
| KVM Switch | Yes |
USB ports and hub features.
Structured visual inspection (v0.1-demo): A fixed checklist completed by the reviewer under standard room lighting. Assessed scores use the same 0–10 anchors for every product.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
Extras that change day-to-day use but are not captured by a measurement.
Notable extras that change day-to-day use.
Structured visual inspection (v0.1-demo): A fixed checklist completed by the reviewer under standard room lighting. Assessed scores use the same 0–10 anchors for every product.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
How the on-screen menu is navigated and organised.
Structured visual inspection (v0.1-demo): A fixed checklist completed by the reviewer under standard room lighting. Assessed scores use the same 0–10 anchors for every product.
Demo dataRecorded Jul 2, 2026· Source: HannahRev demo dataset — illustrative values, not measurements
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