This box contains a digital handheld stroboscope, specifically a Landtek DT-2350PA model used for industrial speed measurements.Function: It is a non-contact, battery-operated tool designed to measure the rotational speed of moving objects and inspect surfaces for defects.Measurement Range: The device typically features a range between 50 and 12,000 flashes per minute (FPM).Technology: It utilizes microcomputer technology, an LCD display for precise digital readings, and can be used for both internal and external triggering.