Domain: Engineering — Instrument and Meter Engineering
Target concept: Infrared Thermometer

Video generation prompt: Point the infrared thermometer (range -20~300℃) at a metal block at room temperature, maintain a measurement distance of 10 cm, and press the measurement button; subsequently, heat the metal block with an alcohol lamp until its surface turns red, then re-point the infrared thermometer at the same position on the metal block, press the measurement button, and aim the lens at the thermometer's display screen.

Evaluation guide:
(i) Target concept: Non-contact temperature measurement using infrared radiation detection, bounded by the thermometer's stated range (-20~300C) and by material emissivity.
Minimum mechanism: Thermal excitation of surface atoms increases mid-infrared emission; a visible red glow on the metal corresponds to roughly 500-800C, which is above this thermometer's 300C upper limit, so once the metal is glowing red, the second reading should show the instrument reaching or exceeding its maximum (a capped/maximum-value reading, or an overflow/error indicator), rather than an ordinary in-range number, demonstrating that the true surface temperature has outrun the instrument's range.
(ii)Storyline: Frame sequence must show: (A) static setup with thermometer aimed at neutral metal; (B) button press -> first display, a plain low number consistent with room temperature; (C) alcohol lamp ignition and flame stabilization next to metal; (D) gradual red color onset on metal surface (not instant); (E) re-aiming of thermometer at same spot; (F) second button press -> second display, showing the instrument at or beyond its maximum reading (a capped number or an overflow/error indicator) rather than a plausible mid-range value; (G) final shot where thermometer lens is oriented toward its own display (reflected or direct line-of-sight). Perspective must be fixed frontal/slightly angled to simultaneously show metal surface, thermometer tip, flame base, and display screen; no POV switches or subjective cuts. Visibility constraints: red color must be unambiguously on metal (not reflection or background), display digits/indicator must be legible without zoom, flame must be distinguishable from glare.

Manual:
Experimental Procedure
1. Point the infrared thermometer at the metal block (room temperature, non-red), hold it about 10 cm away, and press the measurement button.
2. Light the alcohol lamp and heat the metal block until its surface turns red.
3. Point the same thermometer at the same spot on the red-hot metal, press the button, then aim the lens at its own display screen.
Observation of Experimental Phenomena
- The metal block changes from a gray/silver surface to a red surface after heating.
- The thermometer's first reading is a plain, low number consistent with room temperature; the second reading shows the instrument at or beyond its maximum (a capped/maximum value or an overflow/error indicator such as flashing digits or a symbol like 'HHH'/'OL'), rather than an ordinary higher number, because the metal's true surface temperature now exceeds the thermometer's 300C ceiling.
- The alcohol flame stays visible next to the metal throughout the heating phase.
Summary of Experimental Principles
Infrared thermometers detect surface-emitted infrared radiation; emissivity and true surface temperature determine the strength of that signal. A visible red glow corresponds to a surface temperature of roughly 500-800C, which is above this thermometer's stated 300C upper limit — so the second reading should show the instrument's maximum or overflow indication rather than an accurate numeric value, illustrating the instrument's range limit and the need to match a thermometer's range to the temperatures it will actually measure.

Prompt Grounding rubric:
level_1: No infrared thermometer appears in the shot, no metal block is shown, no alcohol lamp is shown, no hand or finger is shown pressing a measurement button, the metal surface is never shown turning red, and the thermometer's display screen never appears on camera.
level_2: At least one of the required items (the thermometer, the metal block, the alcohol lamp, or the display screen) shows up, but they are not used together in the expected sequence: for instance, a button-press action is never shown, the metal never visibly reddens, or the thermometer is never actually aimed at the metal.
level_3: The infrared thermometer, the metal block, and the alcohol lamp all appear in the same scene; the thermometer is pointed at the metal at least once; a hand or finger is shown pressing the measurement button; the display screen is shown at least once; but the metal is never shown turning red, the metal is never heated before the second measurement, or the display is never shown a second time after heating.
level_4: Everything at level 3 holds, and the thermometer is pointed at the metal twice (once while it is still gray or silver, and again after the surface has turned visibly red), with a button press and a display view shown both times; the camera framing and the relative position of thermometer, metal, and lamp stay the same across both measurements; nothing is swapped or newly inserted mid-clip.
level_5: Everything at level 4 holds, and in the final shot the thermometer's lens is turned to face its own display screen (either directly or via a reflection); the metal block never moves from its spot on the table; the alcohol flame stays visible the whole time it is heating the metal; and there is no cut or jump between the first measurement, the heating, the second measurement, and the final view of the display.

Scientific and Causal Correctness rubric:
level_1: The metal block looks blue-tinted, wet, or otherwise cold-looking while the flame is still heating it; the thermometer's second reading looks the same as its first, room-temperature reading; the metal turns red before the alcohol lamp is even lit; or the flame is never shown while the metal is glowing red.
level_2: The metal does turn red, but the alcohol flame is never actually shown touching or near it; the two on-screen readings are identical; the metal changes color with no flame or heat source anywhere in the shot; or the second reading is impossible to make out at all (a blank screen, or a screen with no digits or symbols showing).
level_3: The metal block starts out gray or silver and turns red only after the flame has been on it a while; the flame is visible next to the metal during heating; a display reading appears after each of the two measurements; but something about the readings doesn't add up: for example, the second reading looks lower than the first, the first reading (taken at room temperature) already shows a number above 300, or the display shows an error or overflow indicator during the first, room-temperature measurement, when it should just show a normal low number.
level_4: Everything at level 3 holds, and the metal turns red only after the flame has been held against it for a visible stretch of time; the first reading is a plain, legible number consistent with room temperature (well below 300); the second reading is clearly different from the first: either a higher number, the display pinned at its maximum reading, or a visible overflow or error indicator (such as flashing digits or a symbol like 'HHH' or 'OL'), showing that the instrument has reached or gone past the top of its scale; nothing physically implausible happens (no steam, no melting, no glow appearing to come from inside the metal); the red color stays on the block's surface.
level_5: Everything at level 4 holds, and the red glow is confined to the region of the block the flame actually touched, rather than spreading evenly across the whole block; the second reading (whether a capped maximum number or an overflow symbol) is clearly legible and unambiguous, and visibly communicates that the true temperature has outrun the thermometer's stated 300C ceiling, rather than just showing an arbitrarily larger in-range number; there is no condensation, no smoke hiding the red surface, and no flame that flickers in a way inconsistent with steady, continuous heating.

Spatiotemporal Consistency rubric:
level_1: The metal block or the thermometer blinks out of the shot and then reappears somewhere else; the flame appears or vanishes with no lighting of the wick ever shown; the display screen flashes on or off with no cause; or the room lighting suddenly swings from bright to dark with no visible change in light source.
level_2: The metal block or thermometer is blocked from view for more than a second and comes back looking different; the flame flickers at an unnaturally rapid, strobe-like rate; the display screen appears on camera with no earlier shot of the thermometer itself; or the camera suddenly cuts to an extreme close-up of the display digits without first showing the thermometer in context.
level_3: The metal block, thermometer, and alcohol lamp all remain visible in the same relative arrangement the whole time, with none of them dropping out of the frame and turning up somewhere else; the light in the room keeps the same direction and brightness across the whole clip; the flame flickers the way a real flame does but never blinks out and relights on its own; the thermometer moves smoothly when it is being aimed rather than snapping between positions; and nothing bends or warps that shouldn't: the metal block keeps its shape, the thermometer housing stays rigid.
level_4: Everything at level 3 holds, and the metal block stays in the same spot and orientation on the table for the whole clip; the thermometer looks the same size relative to the metal block during both pointings (i.e., the measuring distance hasn't visibly changed); the flame stays on the same side of the metal block throughout heating; and the display screen shows up in about the same part of the frame both times it is shown.
level_5: Everything at level 4 holds, and the sequence of events plays out in the correct order with nothing skipped or reordered: thermometer aimed at the cool metal, first button press, first display shown, lamp lit, flame brought to the metal, metal turning red, thermometer re-aimed, second button press, second display shown, then the lens turned toward the display; no frame is duplicated or sped up or slowed down in a way that breaks the sense of one event causing the next.