Digital Tachometer Handheld Photo Laser Tachometer Non Contact Digital Tach Meter RPM Meter

Works great - Glad I did not buy a more expensive one. I needed this to check the RPM of a piece of equipment after gear ratio changes. I verified the tachometer is accurate by first checking it against a known motor RPM; it was exactly what I would expect. I used it a handful of times to get the readings I need, and it seems to work great. Very easy to use. I'm glad I did not pay more for the same exact thing with a different brand slapped on it.

I have been having a very good experience with this tachometer. It seems very accurate, of course with any HAND held tachometer you have to make sure you keep your hand VERY steady, especially at higher speeds.. if your hand moves even a tiny bit it will throw the readings way off. I use this to get a precise RPM reading on my milling machine so I can synchronize a tapping head to the spindle. Since the machine uses a variable speed belt, it is impossible to get the machine to produce a precision spindle RPM, but thanks to this tachometer, I don't need precision RPM, I just need to know what it is, then feed that number into my CNC controller to do the math and come up with a feed rate that matches whatever the spindle RPM is. I find that if I rest my hand on my vice when I take the reading, it's very accurate.. If I try to just stand there and hold it at the spindle, well it's all over the place... it's not the fault of the device, it's a simple fact that if my hand moves slightly between rotations, the time it took to get the reflection will be different. I suspect that those experiencing accuracy issues do not realize how critical it is to hold steady, in my opinion at higher RPMs, it would be impossible to hold ANY device steady enough to get a consistent reading.. but if you stabilize yourself on something that is attached to whatever you are measuring, then you can get accurate readings. I have been tapping holes using this tachometer as my spindle speed reference for about a year now with this device and synchronization is perfect.

25% of the 4 units ordered were (was) Dead On Arrival. Utterly useless. The other three, no problems. Amazon's idea of fixing this is to pick up the defective one and then later refund some money. So, to replace it, I have to buy shipping again? For a $14 item, this is absurd- a proper sensible resolution would be "keep or toss the defective one, we'll send you another." PS none of the four came with a cable tie as shown in the photo, but one did have a 9V battery, so, bonus there. Once verified functional by reading a ceiling light as "7200 RPM," the other three units were placed in service and function just like they should. One engineering oversight common to these cheap tachs- the activation buttons are not in a depression- they stick up above the surrounding surface... therefore, when you pack for a road trip, if you don't remove the battery, the other items near the tach will press its buttons and so when you arrive you have a dead battery. One solution is to remove the battery for transport. Another solution is to fabricate a slight bump to surround the button and glue it in place. A *proper* solution would be to utilize good Engineering Practices when designing such an item, and recess the buttons slightly such that a finger activates the function easily but lying the device on its buttons does not. HIGHLY useful for machinery speed indicator in the Lab or in the Field, we use them to show that after some time in service, fan prop speeds are not perhaps what you thought they were, therefore neither is your airflow... Unless you have one of our fans, which maintain the exact speed that you told it to.

This Tachometer is a good value for the money spent. I don't have any way to compare it for accuracy, but it is in the ballpark of the result I would expect. I have no reason to doubt that it is accurate within specs listed. It is easy to use, just follow the simple instruction. while hold the test button let the reading settle in, 2 of 3 second, and you have your reading. After testing push the memory key and hold, the number you get will be wildly random. press the memory button again, and a third time, these two numbers will be very close, and very close to the reading you see during testing. Forget the "MAX" reading, and go with the MIN, and Final readings. One great improvement would have the "Final" reading lock on the display when the test button is released, and have a "clear" button to reset the readout. Good little gadget. I would by it again.

good deal......

I wish I could say that I got my money's worth on an inexpensive tachometer. The description said "In wood and metal working it can be used to accurately measure the speed of a lathe or milling machine.", so I put the tape on the spindle of my lathe and took a video of the result. As you can see, the meter never reads anything except zero RPM. I got some false hopes from looking at the contents of the memory (when I hit the "mem" button), but those numbers are clearly incorrect. They jumped from 59 RPM down to 27 RPM then 24 RPM, but 60 RPM is one revolution per second and you can see that the lathe is doing quite a bit more than that. Even though the "low battery" indicator that was mentioned in the manual was not displayed, I changed the batteries anyway (just in case) and got the same result. This unit is brand new. I received this evening. I didn't even get one successful use out of it, and I'm very inclined to believe the other reviewers who said that it only lasted once or twice.

This is a very very cheap product, but it does work. Not very accurate. I used it to adjust a diesel tach, but it wasn't accurate enough. The idle on my car should be 950 rpm +- 50 and the redline should be 5500. This was 100 rpm off at idle and 1000 off at redline. So I will have to visit a diesel mechanic and get him to adjust the tach based off injector pump timing. But it does work for stuff like fan rpm or other pointless useless stuff like that! Just don't depend on it for cars and important stuff.

I used this tachometer to measure the RPM of a router and a lathe. It requires the use of a single small piece of reflective tape attached to the rotating part. Enough tape is provided to make roughly 30 test pieces. This tape reflects the laser light from the device back to its sensor. Successive measurements give consistent results. The device reads to five digits - true RPM up to 99,999 - should be fast enough for most applications! The tachometer comes with a protective cloth case - nice for storage. Actually measuring RPM is much better than guessing. My router has a speed control dial with single-digit numbers 1 through 6. Its RPM is not linear with the numbers. I was able to calibrate the router numbers with actual RPM - helpful in setting speeds and feeds.

After buying another cheap one to have it DOA I bought this instead and I’m glad I did. I have no way to know how accurate it is, but it functions properly and is accurate enough for what I’m using it for.

Genial.. justo lo que buscaba

Cumple las espectativas

Lecture aléatoire variant de 50 a 1000 tr/min essayer plusieurs fois pas fiable du tout . Je déconseille

only press button to identify the rpm. I have used it for my research purposes. There is no other functionality like recording data. That's a drawback for me.