Measure the rotational speed of a rotating object and inspect the defect on its surface without the need to adhere any mark to reflect the light and thereby without the need to halt the object from its rotation. Features: Provides image of single, two or multiple stillnesses for the vibration object Can be externally triggered or it can trigger external equipment Equipped with Flash timer Allows external triggering device Features instant results Uses very bright xenon lamp Specifications: Measurement Range: 50~12,000 FPM Display: 5 digits, 10mm (0.4") LCD Parameters Measured: Flashes per Minute (FPM) Resolution: 0.1 FPM (50~999.9 FPM) , 1 FPM (over 1000 FPM) Accuracy: ±(0.05%n + 1d) Sampling Time: 0.3 second Flash Adjust: Coarse adjustment, fine adjustment, ×2 and ÷2 for fast check High & Low Range: Manual Conversion (Flashing light is much brighter at low range than at high range) Flash tube type: Xenon lamp Flash tube life 100 Million Set Includes: 1 x Digital Handheld Stroboscope 1 x Spare Flashing Tube Bulb 1 x Power cable 1 x English Operating Manual 1 x Standard Factory Package 1 x Power Plug