| | AR-841 | AR-851 | | Measuring Range | 0.5～15m | 0.5～15m（single Unit） | | 丈量规模 | 1～60m（Double Unit） | | Accuracy | ±0.5% | ±1.5%（single Unit） | | 丈量准确度 | ±2%（Double Unit） | | Measure In Imperial/Metric | √ | √ | | 公英制转换 | | Operation Condition | 0～30℃ | 0～30℃ | | 事情情形 | 30-70%RH | 30-70%RH | | Laser Pointer Aiming Selection | √ | √ | | 激光定位 | | Low Battery Indication | √ | √ | | 低电显示功效 | | Computer Area And Volume | √ | √ | | 盘算面积和体积 | | Sum Of Length | √ | √ | | 盘算长度累加 | | Auto/Manual Shut-off | √ | √ | | 自动/手动关机 | | LCD Backlight | √ | √ | | LCD 背鲜明示 | | response Time | 2s | 2s | | 响应时间 | | Measureing Benchmark Setup | √ | √ | | 丈量基准设置 | | Single Or Double Unit Measure Selection | _____ | √ | | 单机和双机测试选择开关 | | WorkFrequency | 40khz | 40khz（single Unit） | | 事情频率 | 20khz（Double Unit） | | Key Sound,Beeps For Wrong Reading | √ | √ | | And Reading Confirmation | | 按键声提醒,蜕化声音提醒 | | 以及确认声音提醒 | |
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| GENERAL CHARACTERISTICS | 一般特征 | | Power | 9VAlkaline Battery | 9V Alkaline Battery | | 供电 | 9V碱性电池 | 9V碱性电池 | | LCD size | 56*28.3mm | 56*28.3mm | | LCD尺寸 | | Product Color | Dark Gray+Yellow | Yellow+Black | | 产品颜色 | 深灰+黄 | 黄+黑 | | Product Net Weight | 205g | 315g | | 产品净重 | | Product Size | 150*75*46mm | 150*75*46mm | | 产品尺寸 | |
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| PACKING INFORMATION | 包装 | | 包装方式1（中国） | 吸塑 | 吸塑 | | 标准外箱容量 | 20 | 20 | | 标准外箱尺寸 | 48.5*43.7*28.0cm | 48.5*43.7*33.2cm | | 标准外箱毛重 | 6.2kg | 9.1kg | | 包装方式2（Other Countries） | Blister | Blister | | Standard Quantity Per Carton | 20 | 20 | | Standard Carton Size | 48.5*43.7*28.0cm | 48.5*43.7*33.2cm | | Standard Carton Gross Weight | 6.2kg | 9.1kg | |
