I recently received a gift of a 3d printer from my son.The "no cost" way to level the bed, which is required to get good prints, is to use a sheet of paper inserted under the print head extruder nozzle. You adjust the bed one corner at a time by trapping the sheet of paper between the nozzle and the bed until it has a "small amount" of friction when you pull out the paper. You repeat for each corner until they all feel about the same.Because reasonably inexpensive printers can print at about 0.1 MM accuracy this method is OK but not great.I found a 3d printed bracket to mount this Neoteck dial indicator on the print head of my printer. My first test was to use the "sheet of paper" method to level the bed then verify the accuracy using the Neoteck dial indicator. The result showed that the "sheet of paper" method was in some cases off by 0.05 MM which amounts to 50% of the accuracy of the printer itself.The method is to insert the Neoteck into the bracket then push it on the print head with a friction fit. You then can use a g-code file to position the head to each corner and make an exact adjustment. You can also move the head manually to accomplish the same thing. Usually 2 passes to adjust and reverify each corner is required to get the bed almost perfectly level.I have also discovered that the bed leveling can change from one print job to the next even if the jobs were printed back to back without turning off the printer. Bed leveling can also change by small amounts based on the bed heating and probably air circulation in the room. Bed heating is needed to make the very first few layers stick.I have seen what happens when the bed is not level even if just a very small amount. The first layer may not stick on some points or you get some "strings" on the first few layers if the design needs to move the print head in certain ways.The Neoteck device looks and feels durable and comes with a very nice fitted case. It is very simple to use and you barely need the small instruction manual. The accuracy appears to be very good. And all for about $25.So the bottom line is this fairly cheap solution has raised the print quality and the number of occasional "do overs" when you see the first few layer passes don't print correctly.If you are still trying to level without a digital gauge and have random print problems this could help solve your problem if it is related to bed leveling.If you you want to give it a try search your favorite 3d pattern site for "Bed Leveling Bracket" and "Neoteck".I used these to tune my 3d printers. Worked fantastic, only issue but not a deal breaker wish the screen was backlitWorks well. Ordered a magnetic back for it.It does not come with a calibration certificate that is NIST traceable so can't give accuracy 5 stars. The numbers are clear and easy to read, and if you used one these before it is very simple to use. I use to as means of leveling my 3D printer beds.Not accurate at all. Would set it to zero, move it a bit and back to starting point showing it was off. Not returning to zero. Can't be rely on for accuracy. Your best bet is to use an analog vs the digital or spend the money on a better quality digital dial.Nice digital dial gauge. Prefect for leveling my 3d printer z axisI'm not a machinist or an engineer and I'm certainly not qualified to comment on the relative quality or accuracy of this instrument in a broad sense, however, if you are (like me) a redneck with earthly predilections who wants to cull and match carbon arrow shafts and find each of said shafts' radius of greatest resistance to deflection in order to optimize the accuracy of same when fired from a well-tuned modern compound bow in order to punch holes in four-legged animals that will let all the blood out in the most reliable and predictable manner... Well then, this is a pretty darned good bit of gear. Really, for the purposes of spine-matching arrows, the relative accuracy of the instrument is far less important than the consistency of its measurements. I have limited data to make conclusions from, however, for what it's worth, when I measure the same three arrows ten times each I get the same measurements for deflection and spline each time.Doesn't have 4/48 threads. No place in description does it tell you what threads it has for attachments.not holding the value once you press zero, maybe I got a faulty unit as I bought it because of reviewsgood part it feels solid, good sturdy caseThis digital indicator is a great value. Although I do not have a way to test or prove absolute accuracy, I can say that the unit was tested for repeatability and passed with flying colours. My intention was to use this indicator to test for "difference" readings of build-plate height for 3D printing and it helped me to tram the bed very quickly with ZERO guess work. Using one of these makes 3D printer bed leveling a breeze.To help anyone that purchases this unit, and wanted to mount it to an Ender 3 printer (compatible with direct drive conversion) there is a mount specifically made for this indicator. Check on Thingiverse for "NeoTeck Ender 3 side mount"This looks like a quality product as it is even verily heavy and not made of cheap plastic and comes in a nice case.Now had I written this review 20 seconds after I tried it out it would have been a one star review.Let me explain why.I turned it on and all was good and did a few test readings on the millimeter scale. I then clicked on Inches and in two seconds it stopped working and the screen was all jumbled and unreadable. I could not even shut it off to do a restart.I contacted customer support via the Amazon.ca chat window and mentioned this issue to the Seller. The seller got back to me and asked me to try a new battery.I also had trouble opening the battery compartment as even with a sharp knife I could not pry it open. So to avoid damage I also asked the Seller exactly on how it opens and they sent me 3 pictures on how it is done.After opening it, I popped in a new LR44 battery and Bingo it worked perfectly. So it was just the battery and it had about 20 seconds of life left when I first got it.I am going to make a jig for it to use in my table saw miter slot to measure the exact distance of the blade on the left and right to make sure it is exactly the same. As as far as I am concerned this digital gauge is the way to go.I might add that the customer support is also fantastic. And yes I would recommend this to a friend or maybe even a stranger.The button detent for zero is stiff and often results in the indicator jumping a thou or 2, clear lens on readout is flimsy and will break easily, Indicator Point threads were jammed and attempting to swap out the Point is not recommended. 3 Stars at about 20bucks, build quality doesn't demand more than that.Habe mir diese Messuhr gekauft und muss sagen würde ich nicht wieder tun. Ich würde lieber ein paar Euro mehr investieren.Qualität naja Tasten funktionieren manchmal nicht, vorallem die Taste zum abnullen. Wenn man manchmal 10 mal draufdrücken muss ist das sehr frustrierend.Zudem wenn man mal Abgenullt hat zeigt das Gerät manchmal + - 0,5 mm an oder auch mal 0,3 klar man kann dies im Nachhinein abziehen oder dazu zählen aber dass ist nicht der Sinn der Sache.Sie tut zwar dann was sie soll aber es ist trotzdem ärgerlich.Also investiert lieber ein paar Euro mehr und kauft euch was besseres