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@ Venom …… Hey man…… Please PM me your name, with shipping address & DO NOT order a Lii 500. 
PM sent
Very nice teacher! :+1:
PM received & reply sent. :+1:
Thanks, just attempting to “Pay It Forward”. 
This question was asked the other day about the accuracy of the Innova 3320 DMM.
Well I though some of you might find the following interesting.
A BLF friend from the United Kingdom sent me a brand spanking new VC99 DMM and a VRM (Voltage Reference Module). So I decided to test it all out as well as the accuracy of my Innova 3320.
The VRM is programmable to test for 10.0V, 7.5V, 5.0V, & 2.5V… DC of course.
Now please remember, while the VC99 & VRM were brand new; the INNOVA is at least 5 or 6 years old, probably a lot more… and has been riding around in my truck or car for most of those years in a plastic container I got at Walmart. Thru heat of summer and cold of winter too……. in other words it has not had an easy lift.
I’ll just let the pictures speak for themselves…. no adjustments were made to either meter. It was not necessary.
Innova 3320
.
VC99
Wow, that’s impressive.
I have an Etekcity/Uni-T one, and it reads a little low, but nothing major.
Yeah, I was pretty impressed myself. I figured the VC99 would be right on the money since it was new… and it was.
I had no Idea the Innova 3320 would be too though, after the treatment it has received… but it was.
And now all my other “cheapos” are right on the money too after I calibrated them. :+1:
The VRM (Voltage Reference Module) is not expensive at all either…. BUT, well worth it’s money for sure.
They are all over ebay. I think mine was around $5.
[quote=teacher]
Yeah, I’ve got a couple of different voltage reference boards around. Unfortunately, there is no easy way to calibrate my DMM. I can only tell that it’s off a bit.
That’s to bad. I was lucky, even my cheapos had a way to calibrate them.
I had to re-calibrate one 3320 that I had apparently “un-calibrated” a few months ago to a source I though at the time was accurate. :person_facepalming:
Oh well, live and learn. Glad my buddy sent me this VRM though…….
Is the innova 3320 easy to recalibrate?
Yes, very easy. Loosen 2 screws, remove the back, turn it on, hook up the leads, get your little screw driver and turn the “adjuster thing” very slowly till it reads correct.
I then turn it off & on again, recheck, & if all is still good. … put it back together.
That’s it.
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EDIT: … “adjuster thing” = potentiometer
Was it the Uni-t ut61e?
@ teacher It’s good to know how accurate the Innova is and how its been holding up all these years. Its seems like a reliable DMM.
No. I wish it was UT61E, because that one is pretty easy to calibrate.
What I have is Etekcity MSR-U1000 which is a rebranded Uni-T UT61A. This one has multiple potentiometers that could potentially be used for calibration, but so far I have not been able to figure out which one does what and how they interact together, and because the error is pretty small, I decided not to mess with it. Plus, I’m not 100% sure that my voltage reference boards are dead-on accurate either.
FYI, according to my KKMOON rig (based on AD584LH board), the above Etekcity DMM reads low by about 0.22% give or take, so again, not a big deal for me.
Yeah it is Venom, to be honest I was quite pleasantly surprised. 
This one has not been babied at all, I’ve used it on cars, boats, lawn mowers, you name it… plus it has been dropped and mishandled numerous times thru the years. :person_facepalming:
So yes…. I was pleasantly surprised.
Wow, if I am counting correctly I see five (5) potentiometers. … :person_facepalming:
You would have to be an electrical engineer to figure that out…… 
Yup. Someone gave me a link to a technical doc on this DMM, but it was way over my head, so I decided that if it ain’t broke (too badly), don’t fix it.
Yeah that is pretty small Pete, 6/1000th’s. Close enough for ‘gooberment work’…….
I like that “case” your VRM is in too……… :+1:
~
Now, if you don’t mind; I have a question for you about you picture below…….
Below the Voltage readout & below where it says “Autorange” there is a group of short vertical lines numbered 0 to 40. It appears as a “horizontal graph” that is reading “38”.
What does that represent or tell you/us
The VC99 is the first DMM I have ever owned that had those.
I have no earthly idea what they represent & if it tells in the “manual”… I can’t find it.
.