The NateChrony v2 Black/Clear Polymer with 2 x 1/2 UNF Adapters. We made the NateChrony even better - smaller, lighter, more compact, it has all the features and benefits of the standard and mini NateChrony combined. We have also increased the internal diameter up to 16mm, so no issues with big bore and larger power rifles. The premium option also features an aluminium shell - in either good ol black, stone or a limited edition colour. The NateChrony is a barrel mounted ballistic chronograph for all Air Rifles and airsoft. We have independant lab certification - so it is accurate, affordable, super easy to use, and best of all - no more missed readings! The NateChrony mounts onto your barrel with one of the adapters for perfect alignment every time. Using your mobile phone as the screen and battery(standard 5v USB), means you get the best display on the market and never get surprised by a flat battery in your Chronograph. The NateChrony is fully featured and will provide all the data even the most demanding tuner requires. It displays a current shot string, and has four additional save slots (1,000+ shots) - all of which retain the data when power is lost. All configuration is performed via a simple web page interface (no internet required). 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). Specifications Accuracy: calibrated to be within 1fps of actual pellet speed at 1,000fps from a certified set of master chronographs Resolution:.