During my last rang trip, my old chronograph was doing everything but working correctly. There appeared to be a problem with the digital display as only the top line was showing any data. Also, I could not get a velocity reading regardless of what I tried. Having used it a lot over the past years, I decided it was time to try a new chronograph. I knew I wanted nothing to do with those that had the display and screens combined in a single unit. The big name, Oehler, was more than I needed or wanted to spend. After a bit of research, I decided to give the Competitive Edge Dynamics M2 Chronograph a try. This review will detail a few things about the M2 chronograph, my first impressions, and its performance at the range.
I ordered the M2 from Graf & Sons, Inc.
They were offering free shipping along with the best price I could find.
It arrived in a few short days, packed properly in a shipping box with those
The chronograph, as shipped, includes everything needed to get you up and going
in short time. One thing I found helpful was the supplied instructional
DVD. It provided a nice description of how chronographs work and the
issues one might come across in regards to environmental conditions you'll find
on the range. The DVD also included information on setup, testing, and
range use of the M2 as well as a run down of its features and functions.
The M2 has two sensors, one for starting and the other for stopping the
chronograph. It is important that the sensors are spaced the correct
distance from each other. A tiny error, such as 1/16" or 1/8", will result
in a velocity error as much as 100 feet per second or more. To help ensure
this does not occur, the sensors are designed to mount flush to the ends of the
The bottom of the sensor has an adjustment knob (flush with the sensor) that
tightens a mounting plate securely against the mounting bracket. All you
need to do is slide the sensor onto the end of the mounting bracket and tighten
the knob while ensuring the sensor is pushed as far onto the mounting bracket as
possible. This is then repeated with the second sensor on the other end of
the mounting bracket.
With both sensors properly attached to each end of the foldable mounting
bracket, the sensors are automatically spaced exactly 2 feet apart. This
is the correct distance for the main unit's (computer) algorithm for calculating
the velocity which is done using v = d/t, where velocity = displacement (change
in position) / time. The start and stop sensors control a very fast and
accurate timer. It is this high speed timer that allows the M2 to
calculate velocities ranging from 50 to 7000 feet per second.
With the sensors attached to the mounting bracket, two side rails are now
slipped into the two slots, either side of the sensor.
More CED M2 Chronograph
4x4 Off-Road Homestead Firearms RC Models