Unable to zero - adjustments are useless
584229
I had high hopes for this little sight.  It has 5 brightness levels for the red dot plus the laser.

The red dot is ok except for one BIG problem, it's impossible to zero.  I mounted it on my Stag AR carbine and took it to a 200 yard range.  It consistently shot high to and the right.  No amount of fiddling with the adjustments moved the impact point.  turn the knobs all the way in, no change.  Turn them all the way out, no change.  I centered the dot on the front sight for consistency, i could not hit anything!  At first I carefully shot from a steady rest at about 25 yards - all shots were way to the right or missed the target completely.  Like i said, impossible to zero.

To make sure it wasn't the gun i removed the site and used the stock stag flip up, dual range peep site that came with the gun.  Dead on accurate at 200 yards, using the peep sight.  It's just sad when your iron sights are more accurate then your optical sight.

Would have like to tried the laser but it is useless in daylight. It's completely invisible in bright, or even normal light.

I returned it to the store Turner's outdoorsman, and got the 4 power NC Star "sniper" scope, that's about the same price, with the illuminated reticle, plus an NC star weaver riser mount i am waiting to receive (cannot use the iron sites without it, and your cheek is way too low on the stock without it to see through the scope properly with the right eye relief.)  I am hoping this sight turns out to be more accurate...

I cannot recommend the NC Star 40 red dot sight.  Wanted it to work, it didn't, it's fine in many ways but if you cannot zero it, it's useless crap.  Get something else, something better if you want a red dot sight for a center fire rifle.
2481072
I'm joining the people who gave it one star.  an excellent concept, but its far too difficult to adjust.  maybe if I had three hands it would be easier.  could not get it at the right height after 20 minutes, so its going back.  I had high hopes, but this does not work as promised.
1251863
Tried setting by feel/eyeball multiple time with no luck.
Used the proper tool and it worked like a champ first time.
Imagine that.
3120079
Does NOT work as described. Says that it is adjustable from 45 degree to 90 degree, but the only plates that hold it anywhere near steady(and I use steady lightly, since my attachment still moved all over the place) are at 45 degree angles. There is no way to lock it at 90 degrees.

Even when correctly tightened, at 45 degrees, attachments still have a small up and down give; I don't want to imagine what this equates to during the recoil from a rifle.

I would not recommend this product to any one. I was expecting, based on the item's description, to be able to flip back and forth from 45 to 90 degree angles in a semi-locked position which could be manually lifted and readjusted(for storage reasons I wanted to be able to flip back to 90). Complete garbage.
2014789
Setting the baseline to zero took several tries (you have to hold a specific reset button in a specified way/time)
Once zeroed out it works great.

I'm using this for measuring fly line diameters, I'm not relying on this for professional or safety levels of accuracy. I needed something that was easy to handle and read.
1226131
I liked the idea. Flipped out of the way when not in use.  However I had to purchase a different set because I could not get enough adjustment from the sights. They wouldnt zero. Havent figured out if new (different brand) set is the same yet. Will try to update when that is determined. Would not recommend.
3895228
It is noiseless and eats up quickly. These are the good points.
However, the adjustment settings did not work for me. I bought 2 such heaters. The first one seemed to work great for a few weeks, so I bought a second one. I had the second one replaced due to adjustment settings not working. Same thing happened with the second one. I returned it for a refund.
The first one adjustments have the same problem, but it is too late for a return/refund. My first power bill came in, though this winter is colder than expected, the bill was 40% higher overall. Both heaters were the only 2 additional units heating the house this year.
3238036
would not adjust elevation and windage.  Returned it back to the seller, who was very prompt in returning the purchase price.
2372359
Seems to do okay but no way to calibrate. I was unable to calibrate the unit based on the instructions. Instructions say to press "C/F/K & Power" the LCD display "USE2 T1" but pressing any combination of C/F/K and Power does NOT put the unit into a calibration mode. The whole idea of calibration is that you can calibrate at 0C and 100C (ice water and boiling water, respectively) but if you cannot do this, the unit cannot be used reliably.
516956
It would not adjust. It was like frozen. I let my contractor look at it and he said it was just faulty.
3380404
Just got mine for my Reba and adjustment feature did not work!! Very frustrating. Only allowed me to turn once then froze up. Will return and order new one.  Hopefully better luck...
3199076
I got these so that I could (hopefully) hit things at an angle. The 2.0, 1.5 and 1.3 are now completely useless. This past weekend at the track I was unable to get screws undone because these kept spinning and spinning. I took it to one of the veterans at the track and using MIP hex set, he easily got them undone.
277418
When my son set this up I simply couldn't believe that it has no provision for adjusting the angle of the screen.  It's at a very awkward downward-facing angle.  The lack of this feature alone is enough to make me return the monitor.  Do we really want to deal with a book or piece of wood under the stand for the life of the monitor??  [no]
Otherwise a sharp looking product -- but function is more important than form.
3765959
Works well, but the zero adjustment seem to drift.  Not sure why - I may amend this review after more usage.
623891
Never got it to work. The section that you apply the weighted puddy in is too thin and hard to adjust. There were no instruction as mentioned on tutorial for altitude adjustments.
3526688
The 0-1" and 3-4" that I got lose position when turned off. I have to re zero constantly. Completely defeats the convenience of a digital micrometer.
2023052
after many tries and calibrations still doesn't work, would like to trade for a new machine