Ok if you don't require accuracy.
925920
Completely off. I popped it in my mouth and got 92. I tried the same thing with a cheap grocery store one I bought and got 98.9. This thing is a piece of crap.
788591
These are junk. Calibration Is highly questionable. It at least puts you in the ball park, but if you need accuracy in your readings just remember you get what you pay for.
340059
Works in a pinch but not always very accurate.  But for the price i can not complain.
222795
This beats measuring rooms with a ruler.  I'm just a casual user and not professional, so in terms of accuracy, I can't say for sure if it's off.  For casual use, this is accurate enough for me.  I don't use the stand that much, I find it kind of clumsy.  Just brace it against the wall and presto!
378626
As long as your course has laser targets on their flags, this thing picks up the pin nicely. If not... it can be a mess if there is anything behind the pin. Software is a bit janky and the UX isn't always clear/user-intuitive.

That said, it does it's job and for the price, it's just fine. If you want something better, upgrade to a Bushnell. For someone who wants a tournament-legal rangefinder on a budget, this will do.
4118433
It is what it is.  Received as advertised.  Accuracy is only with 3 degrees or so.
2815070
Seems to be fairly accurate but have found slight differences between the Swami and other units used by fellow golfers.  Also off a little when compared to yardage markers on course.  Since I'm not good enough to worry about exact yardage, it works well for me.
4305146
Some examples are simplified to a point they are no longer accurate. A sub-par attempt, possibly for self-indulgent entertainment.
4338350
I have now purchased five of these gauges from Amazon over the last two years or so for myself and family.  I like the ease of use with the flexible hose and the angled connection for tightly spaced spokes on garden carts.  However, one of these five gauges reads low by four pounds.  The other four read exactly the same and are within six-tenths of a pound of the reading from a digital gauge.  I also have two other dial type gauges that read low by two pounds and three pounds.  My conclusion is that tire gauges tend to be inaccurate, and that this brand is probably as accurate or better than most, but not perfect.  One needs to compare readings with other gauges and gain confidence on which way, if any, the readings from a particular gauge need to be adjusted.  That said, these gauges are the easiest to use and read that I have ever owned.
2413499
It works for plinking loads but I would upgrade for more accuracy.  It's also messy.  It functions but do not expect too much.
2316775
Only moderately accurate, but enough to comfort me that the temperature in my fridge is within range. Tends to lock up and probably shouldn't be used with regular alkaline batteries.
962589
If you are trying to tune a match trigger and need accuracy within a few grams, do not buy this scale.  If you can afford to play seriously in the match shooting game, you can afford something much higher end than this.  But if you're looking for a way to measure the trigger pull on your basic field rifle, AR15 or double-action revolver, this will probably serve you just fine.
Is it calibrated? Probably not perfectly.  It's a spring inside a metal tube, for pete's sake, not a medical instrument.  But what difference does that make for most of us?  I use a scale when tuning an action.  If I use this "before" and it reads 7lbs, then read it "after" and it shows 4lbs, then I know my work has been effective.  If that "4lb" reading is actually 4lbs, 4oz...I don't care.  The relative change and the final feel under my finger are much more important.
This is a $25 scale and it does the job of a $25 scale.

I'm using this right now on a S&W revolver job and it works fine.  I take the measurement several times and get a pretty good average weight.  Like all spring scales, you need to take your time and weigh the break carefully, but it's not hard to get fairly consistent measurements (within maybe 3 or 4 oz from pull to pull) and those differences are mainly from the operator, not the tool.

It's a simple design.  the little plastic ring will probably pop off or get broken sooner or later, but as someone else suggested, you can probably rig a twist-tie in its place and go back to work.

It's functional and inexpensive.  Certainly good enough for most basement gunsmiths.
3842375
Nothing special here. It tells me how far I've walked and it's fairly accurate. It's a pain to look and finally see that the battery is almost dead with little to no warning. The syncing with your phone can sometimes be a pain in the butt. I would not purchase this again given a choice and I'm no longer wearing it.
2466995
The accuracy is not always on target. Don't like that you have to charge it every week. Should have purchased the plug in option.
493750
Though cheap, you get what you pay for...this rarely is accurate and is pretty worthless.
2742273
Not bad for the price. However, if absolute precision is a must, then the small bit of play in the sliding mechanism may be a deal breaker. Things are a little inconsistent on my unit when in the hundredths.
3861331
This has been a good tool. I would say it is within a couple of degrees or better as far as accuracy.