MRAD Checker
You will need
- an A4 or A3 sheet, or another accurately measured object
- an accurately known distance
- a clear view of the object through the scope
Useful paper dimensions: A4 short edge 210 mm · A4 long edge 297 mm · A3 short edge 297 mm.
Your previous measurement has been restored. You can edit any value below and check again.
Example only: read the total measurement, starting at a clear graduation and ending wherever the object edge actually falls.
Getting an accurate reading
Use the largest measurement you can read clearly on your reticle. A bigger measurement usually gives a more accurate result, because a small reading error becomes a smaller percentage of the total. Some reticles read clearly to around 10 MRAD, others to 15 or 20 MRAD using the extra graduations near the thick posts - use whatever is the largest you can read clearly.
Frequently asked questions
Which part of the paper should I use?
Use the longest edge you can measure clearly with your reticle. A bigger measurement usually reduces the effect of a small reading error.
Does my scope need to be set to a particular magnification?
No. This Tool checks the reticle in the setup you are currently using. If the scope is variable, leave it at the magnification you want to test.
Does this work with an FFP scope?
Yes. An FFP reticle should normally keep the same angular scale throughout its magnification range, but this Tool can still check whether its marked scale is accurate.
How accurate must the distance be?
As accurate as reasonably possible. Measure from the scope to the object using a tape measure. If the object is off to one side, measure the actual diagonal distance.
Why should I repeat the test?
Blur, object alignment and reading fractions of the reticle can all affect the result. Repeating the measurement helps distinguish a real calibration difference from a measuring error.