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| GENERAL FEATURES & SPECIFICATIONS | 一般功能和规格 |  
|  | AR-811 | AR-821 | AR-831 |  |  
| Measuring Range | 0.30~15m | 0.30~15m | 0.30~15m |  |  
| 测量范围 | 10inch~50foot | 10inch~50foot | 10inch~50foot |  |  
| Accuracy | ±1% | ±1% | ±1% |  |  
| 测量精确度 |  |  
| Measure In Imperial/Metric | √ | √ | √ |  |  
| 公英制转换 |  |  
| Dynamic Display | √ | √ | √ |  |  
| 动态读数显示 |  |  
| Laser Pointer Aiming | √ | √ | √ |  |  
| 激光定位 |  |  
| Data Store /Recall | √ | ____ | ______ |  |  
| 存储/调出数据 |  |  
| Computer Area And Volume | √ | √ | √ |  |  
| 计算面积和体积 |  |  
| Sum Of Length | √ | √ | √ |  |  
| 计算长度累加 |  |  
| Auto/Manual Shut-off | √ | √ | √ |  |  
| 自动/手动关机 |  |  
| LCD Backlight | √ | √ | √ |  |  
| LCD 背光显示 |  |  
| response Time | 2s | 2s | 2s |  |  
| 响应时间 |  |  
| Measureing Benchmark Setup | √ | √ | √ |  |  
| 测量基准设置 |  |  
| KeySound,Beeps For Wrong Reading And Reading Confirmation | √ | √ | √ |  |  
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| 按键声提示,出错声音提示 | √ | √ | √ |  |  
| 以及确认声音提示 |  |  |  
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| GENERAL CHARACTERISTICS | 一般特征 |  
| Power | 9V Battery(6F22) | 9V Battery(6F22) | 4*1.5VAAA Battery |  
| 供电 | 9v(6F22) | 9v(6F22) | 4节1.5V AAA电池 |  
| LCD size | 35*23.5mm | 35*23.5mm | 35*23 |  |  |