The original NateChrony! Black/Clear with 2 x 1/2 UNF Adapters, .177 to .30 cal The Clear case allows for maximum visibility of the power light - so you know it has power & its working. A barrel mounted chronograph for all air powered rifles. Highly accurate, compact and convenient - mounts directly to your barrel so you never miss a shot. Adapters available for other barrels (non-threaded) and other threads upon request. Powered by USB there's no batteries to worry about or anything to charge. Simply plug it into your mobile phone, tablet or USB power bank and you're set. Once powered you connect to its WiFi network and open a web page in a browser. Simple! No apps to install, no privacy or data concerns. All results viewing and configuration is done via a simple webpage interface - no button sequences to remember! Caliber: up to 30cal 7.62mm (contact us for larger calibers) Comes with 1x Standard and 1x Slimline adapter. Standard Adapters: Have large, easy to grip tabs to mount/unmount the adapter to the barrel - even in cold conditions while wearing gloves. However this adapter may not work on bullpups where there is minimal clearance between the barrel thread & an airtank or accessory. If you have small clearances then use our slimline adapters. Slimline Adapters: Have smaller grip tabs to mount/unmount the adapter to the barrel. Perfect for bullpups or where there are minimal clearances between the barrel thread & an airtank or accessory. These can be used where there is lots of clearance, however if you shoot with gloves or in the cold - the standard adapters may be an easier option to use. It can store over 1,000 shots! At least 250 in the current shot string, with 4 save slots also holding at least 250. Reads in either Metric (mps & joules) or imperial (fps & ft/lb). The NateChrony is always black, with different colours available for the cover & threaded adapters. Each NateChrony comes with 2 threaded adapters.