Scope mounted rangefinder - ATN 1,500 yard Auxiliary Ballistic Laser Rangefinder for Smart HD Scopes

The reason I rated this product at a 2 star is because it uses CR2 3V batteries. They are very expensive and rechargeable ones are not readily available. Each battery only lasts a maximum of 10 hours (likely because a laser is constantly on). This is a very poor design by the manufacturers. However the rangefinder does work reasonably well and wasn’t too difficult to install and use. Hopefully soon there is a better version that comes out that fixes the significant battery problem.