Phaser Stroboscope Flashes per Minute 30 to 50 000 RPM Range 5 to 250 000 Resolution 0.01 fpm Display 6 Digit LCD Accuracy +/-0.002 Percent Average Power (W) 13 W Phase Shift External Flash Output (Joules) 230 mJoule External Input/Output Triggers Yes Flash Duration 8 to 20 usec Power Requirement Internal Rechargeable NiMH Battery Recharge Time Less Than 4 hr Battery Life Typically 2 hr @ 1 800 fpm Includes 115/230V Charger Instructions NIST Certification