The calculator has been designed with target shooting competitions in mind – the target size scale ranges from 4 – 40 inches and on the back side of the calculator are the exact measures of most common targets (IPSC ja IDPA).
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.
Size: the diameter of the calculator is 4,53 in (11,5 cm).
B-grade calculator is accurate to ca +- 2 percent: enough to avoid the math and deliver fast distance measurement.
Why are we selling B-grade products? Because they are good enough for most applications. The error of these calculators is still smaller than the error of MIL’s measurement through the cope on most targets…
and because it is really hard to produce A-grade. No matter how hard we try, some percentage of the production will not match the high standard of A-grade.