This is the new version of the calculator where the back side has different reference targets attached
Round MilDot calculator allows very fast and accurate target distance measurement. For the distance measurement it is only necessary to align the MILs scale with actual target size scale and the distance to target can be seen from the Distance Window.
The calculator has been designed with target shooting competitions in mind – the target size scale ranges from 0.15 – 1 m and on the back side sticker of the calculator are the exact measures of most common targets (IPSC ja IDPA) and objects. NB! Traffic sign sizes are not the same in all EU countries. I have used general provision from this 2016 draft and checked the sizes against page 74 of this report. The traffic signs sizes printed on the sticker are: urban area, single lane highway, dual lane highway and motorway.
A-grade calculator is accurate to ca +- 0.5 percent.
Size: the diameter of the calculator is 11,5 cm (4,53 in).