If you would like to order this item, then please forward your home details and phone number and we will call you for payment , delivery cost on a chronograph is an extra £10, [email protected] The compact device for measuring your kinetic and velocity reading up to 6500fps. Suitable for all types of airguns, Co2, Paintball and airsoft guns. Practical solution and very reliable, We have also found it excellent in lower light conditions where a lot of chronographs fail. Parameters: velocity: 20 – 6500 fps measurement error: <= 1% @ 800 fps current consumption: 100 mA power supply: 2AA (alkaline or rechargable battery) dimensions ( h x w x d ): 210x100x100 mm weight 600 g Functions: velocity V [fps] kinetic energy [Ft/Lbf] shooting counter average kinetic energy [Ft/Lbf] average velocity Vavg [fps] minimum velocity Vmin [fps] maximum velocity Vmax [fps] absolute velocity dV=|Vmax-Vmin| standard deviation SV [fps] rate of fire RoF weight of bullet in grains calibration ( settable distance between sensors ) memory of 250 measurements of velocities transmission data to the computer