AR-831超聲波測距儀功能和規格 ：
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| AR-811 | AR-821 | AR-831 |
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| Measuring Range | 0.30～15m | 0.30～15m | 0.30～15m |
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| 測量范圍 | 10inch～50foot | 10inch～50foot | 10inch～50foot |
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| Accuracy | ±1% | ±1% | ±1% |
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| 測量度 |
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| Measure InImperial/Metric | √ | √ | √ |
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| 公英制轉換 |
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| Dynamic Display | √ | √ | √ |
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| 動態讀數顯示 |
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| Laser PointerAiming | √ | √ | √ |
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| 激光定位 |
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| Data Store/Recall | √ | ____ | ______ |
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| 存儲/調出數據 |
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| Computer Area AndVolume | √ | √ | √ |
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| 計算面積和體積 |
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| Sum Of Length | √ | √ | √ |
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| 計算長度累加 |
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| Auto/ManualShut-off | √ | √ | √ |
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| 自動/手動關機 |
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| LCD Backlight | √ | √ | √ |
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| LCD 背光顯示 |
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| response Time | 2s | 2s | 2s |
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| 響應時間 |
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| Measureing BenchmarkSetup | √ | √ | √ |
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| 測量基準設置 |
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| KeySound,Beeps ForWrong Reading And Reading Confirmation | √ | √ | √ |
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| 按鍵聲提示,出錯聲音提示 | √ | √ | √ |
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| 以及確認聲音提示 |
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