闪频测速仪DT2240B采用微型计算机技术(CPU)、光电技术。抗干扰技术等先进技术实现非接触转速测量，以及检测运动物体的状态和表面缺损。超大屏幕液晶显示带背光数字控制调整闪频频率电源消耗低测量范围：60~39,999RPM粗调/细调幅度：<1,000RPM粗调±10RPM                         细调±0.1RPM             ≥1,000RPM粗调±100RPM                         细调±1RPM准确度：±0.05%分辨率：<1,000RPM：0.1RPM       ≥1,000RPM：1RPM10个常用转速存储功能，提高测量效率。闪光光源强度比DT2239B提高100%电源：4x1.5V AA电池 STROBOSCOPEMODEL: DT2240BThis tachometer is used the microcomputer(CPU) technique, photoelectrical techniqueand LCD for one instrument combine PHOTOTACH & MOTION & SURFACE MAR.Large LCD display with backlightDigital control adjust flash frequenceLow power consumptionMeasure range: 60~39,999RPMCoarse/Fine adjust amplitude:  <1,000RPM Coarse adjust: ±10RPM             Fine adjust: ±0.1RPM  ≥1,000RPM Coarse adjust:±100RPM              Fine adjust: ±1RPMAccuracy: ±0.05%Resolution: <1,000RPM: 0.1RPM         ≥1,000RPM: 1RPM10 commonly functions for rotational speed storage,improves the efficiency of measurement. The intensityof flashlight is increased 100% than DT2239B.Battery: 4x1.5V AA battery