This 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: ±10RPMFine adjust: ±0.1RPM≥1,000RPM Coarse adjust:±100RPMFine adjust: ±1RPMAccuracy: ±0.05%Resolution: <1,000RPM: 0.1RPM≥1,000RPM: 1RPM10 commonly functions for rotational speed storage, improves the efficiency of measurement. The intensity of flashlight is increased 100% than DT2239B.Battery: 4x1.5V AA battery

DT2240B Digital Stroboscope , Measure the speed of moving objects