STROBOSCOPE Features: Extruded aluminum, NEMA 4X construction: Extraordinary durability yields long service life Internal battery supply: Lightweight; enables easy portability Repeatable accuracy (± 0.01% of reading): Fully meets the strictest tolerances Phase shift (in degrees of delay time): Enables visual analysis of rotating/reciprocating objects through all points of motion/time/angle Flash timer control: Prolongs flash tube life Manual flash controller knob: Permits easy/accurate adjustments to flash rate Continuous duty cycle: Eliminates downtime waiting for unit to cool Highly polished focused reflector: Prevents “blind” viewing areas Designed from the beginning for harsh use. The DT-315P is a rugged, sealed (IP65) Stroboscope suitable for working in areas without AC power. The DT-315P works just like the DT-315A battery operated strobe, however flash tube life is increased, so maintenance of the DT-315P is less. Equipped with Phase shifting in angle of delay (0-359 degrees) and flash time delay, (0-300 mSec) the DT-315P is engineered for checking speed, timing and wear on rotating and reciprocating machinery With its rugged “bumper”, sealed body, and internal (rechargeable) battery, the DT-315P provides the maintenance and quality professional, a rugged and accurate strobe-tachometer for inspection in harsh environments, of presses, conveyers, gear reducers, chain drives, fuel injectors, spray (paint) patterns, and many other industrial applications. Includes: Input/Output signal plug AC Adapter User Manual Specifications: Flash Range:     100-30,000 FPM Accuracy:     ± 1 digit Signal Range:     200-3,000 rpm/fpm Delay Setter:     Rotary Encoder Display:     4 digit, 10mm high Red LED Divide Ratio:     1/1, 1/2, 1/3, 1/4, 2/4 with shift Input Signal:     High level 50 to 24v pulse width 2 msec min. Lo level 0 to 1v Pulse width 2 msec min. Output impedance less then 10 kΏ; Input Impedance:     47 kΏ; Display Mode:     Phase shift (degree), Tachometer Flashtube:     Xenon lamp, max 10 W at 1,5000 rpm Operating Temp:     0 to 40° Power Requirements:    115 V AC or 230 V AC Adapter or one (1) hour, internal, rechargeable 12 V battery