Check the listing for details. Competition Electronics ProChrono LTD CEI-3825. Color: Gray, Condition: Used. Listed at 154.99 USD. The new generation of our popular ProChrono model based on a time proven design that has been measuring "almost anything that shoots" since 1985! Great for firearms, shotguns, archery, airguns, and paintball. Everything is included for outdoor use. Features:Internal and external refinements with updates to the circuitry and enclosure designBuilt in full featured operating system with multiple shot string memory and statisticsSensing system compatible with a wide variety of light conditions and projectilesFaster internal shot clock for improved accuracy to +/- .5% or betterMade in the USA quality at an affordable priceTwo year warrantee against defects in material and workmanship, and a 1/2 price repair guaranteeOver 30 years of experience in chronograph design and manufacturingReplaceable Alkaline 9 volt battery power (not included) for 20+ hours of operationQuality accessories and replacement parts at a reasonable priceMade in USA with real service and support SPECIFICATIONS:Velocity Range: 20 – 9,999 feet per secondTemperature Range: 20-100 degrees FahrenheitSize: 16" x 4" x 3-1/4"Weight: 2.1 lbs.Battery Required: One 9-volt alkaline batteryBattery Life: Approx. 20 hours of operationCurrent Consumption: Approx. 15mATripod Mounting Hole Thread Size: 1/4" - 20Guide Wire Size: 3/16" x 16"Memory Capacity: Up to 9 strings of up to 99 shots eachReview Statistics Capability: Individual shot velocities, High, Low, Average, Extreme Spread, and Standard DeviationMinimum Time Between Shots: 500 mSecShot Timing Resolution: 31 nSec (8000 counts @ 4,000fps) Crystal ControlledAccuracy: +/-.5% of measured velocity or better