No Off Season is proud to be the first retailer outside the tactical market to offer the Slope Doper inclinometer. This handy instrument is totally mechanical requiring no batteries or software. It reads the angle of incline as well as cosines. Either multiply the yardage by the cosine factor to get a practical "shoot to" distance or plug the value into your ballistics software to get your firing solution. Unlike more expensive Angle Degree Indicators (ADI's) and Angle Cosine Indicators (ACI's), the Slope Doper can be used with multiple rifles. It is highly portable just slip it in your pocket, backpack or range bag. It's virually indestructible and foolproof. Just sight along the top of the Slope Doper or lay it on a surface parallel to the bore, read the angle and/or cosine, adjust your elevation call and shoot . Check it out here: Slope Doper at NOS Take the mystery out of uphill/downhill shooting. At $25.95, there is no reason to miss that angled shot again.