Yes, you do get two readings (with the Oehler).
The thing is, I didn't realize that the Pro Chrono was a good unit until I used the Oehler. I get very similiar results out of both of my units.
Hey, I'm not trying to start any fights. I am just making it evident to the readers that there really is no way to know if a chronograph - any chronograph or velocity recording instrument - is producing good data unless there's at least a second velocity being recorded for each shot fired.
I 100% agree with your statement that "I didn't realize that the Pro Chrono was a good unit until I used the Oehler."
I would also 100% agree with this statement of my own creation. "I couldn't have realized that the 'XXX brand and model of chronograph' was a bad unit until I used the Oehler." Which really does call into question the wisdom of relying on any chronograph that only provides a single data point. I have interacted with any number of chronograph users of the Shooting Chrony, as well as other brands/models of chronographs that provide only a single recorded velocity for each bullet fired, that didn't end up with a unit as reliable as yours seems to be. To the point that they've lost all confidence in ANY chronograph velocity data.
Certainly, how vital it is to know one is recording valid data depends on what one intends to do with the data. What are the end uses of the data? If the intention is to develop accurate average MV data for insertion into ballistics programs to model bullet flight from the muzzle out to the extreme ranges engaged in LRH, and if the goal is to develop hand loaded ammunition that is not only accurate at 100 yards, but will be accurate at 1000 yards because the ES and SD of the loaded ammo is low, then I think a fellow out to have at least two velocity data recorded for each and every shot fired. Which is what the Oehler 35 provides.
It's possible to do this without purchasing the Oehler 35, as I used to do with two separate chronographs that were both relatively low cost units. I initially used an Oehler 33 and a PACT PC2, run in tandem, to obtain my two velocity points. That was how my eyes were opened. I saw the light - so to speak. After just a short period of use, I began to be able to identify the shots that provided bad recorded velocity over either one, or both chronographs. I had less than $200 in the entire setup. Both chronographs were purchased as older used models and units. And both have, over the years, been proven to be good enough to get the job done when operated concurrently. But neither chronograph, if run solo, were good enough for me. For my end uses of the data. It wasn't until I ran them in tandem, concurrently; obtaining two velocities for each shot fired, that I was able to identify and discard the bad data that would occasionally be recorded. Here's a photo of the skyscreen stand I constructed to hold the skyscreens for the Oehler 33 and PACT PC2.
My impression is that the OP is pretty serious about collecting reliable data. The only way to collect reliable data is to have some means of validating the data. The only way to begin to have any means of validating the data from chronographs is to have a minimum of two data points for each shot fired. I did that on-the-cheap by constructing a skyscreen rail that allowed me to run two separate chronographs concurrently. For those that don't want to, or are unable to, go through this effort the Oehler 35 is the only retail unit for sale that provides two recorded velocities for each bullet fired. Which is why the Oehler 35 is the only single chronograph that I would recommend for any user that requires validation of the data prior to using it to predict 1000 yd ballistics.
Here's a link to a Thread that provides my experiences with collecting bullet velocity data with the units I've employed over the years. This Thread will provide further explanation of the points I'm trying to make in this Thread, if any reader is interested enough to survive the long read:
http://www.longrangehunting.com/forums/f19/new-oehler-35p-new-skyscreen-rail-first-test-data-60778/