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| Brand | A&D |
|---|---|
| Origin | Japan |
| Manufacturer | A&D Co., Ltd. |
| Type | Imported Instrument |
| Model | AD-3253 / AD-3253B |
| Thickness Range | 0.8–100 mm (AD-3253: 2–200 mm) |
| Accuracy | ±0.1 mm |
| Weight | 180 g |
| Power | Single AA alkaline battery |
| Battery Life | >30 h continuous operation (at 25°C, 5 mm steel sample) |
| Auto Power-Off | After 5 min idle |
| Display | Backlit LCD |
| Units | mm / inch selectable |
| Sound Velocity Input | Adjustable via keypad, stored non-volatile memory |
| Calibration | Single-point material calibration for velocity determination |
| Standard Accessories | Protective leather case, 5 mm calibration block, instruction manual, probe holder (AD-3252 only), dual probe (optional) |
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