GENERAL FEATURES & SPECIFICATIONS一般功能和规格AR-841AR-851Measuring Range0.5～15m0.5～15m(single Unit)测量范围1～60m(Double Unit)Accuracy±0.5%±1.5%(single Unit)测量精确度±2%(Double Unit)Measure In Imperial/Metric√√公英制转换Operation Condition0～30℃0～30℃工作环境30-70%RH30-70%RHLaser Pointer Aiming Selection√√激光定位Low Battery Indication√√低电显示功能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 Time2s2s响应时间Measureing Benchmark Setup√√测量基准设置Single Or Double Unit Measure Selection_____√单机和双机测试选择开关WorkFrequency40khz40khz(single Unit)工作频率20khz(Double Unit)Key Sound,Beeps For Wrong Reading√√And Reading Confirmation按键声提示,出错声音提示以及确认声音提示