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More "affordable" digital precision scales: A&D GF series

Hey all, first post, but it looks like there is a bit of interest in precision scales/balances here on Accurate Shooter. I wanted to share some experience I've had digging around for budget options for precision digital scales/balances.

I'll be the first to say most folks, if budget allows, should hit the easy button and pick up the FX-120i or other high quality scales from reliably retailers.

However, I'd bet some other folks are on a bit more of a budget and/or enjoy doing a little deal shopping. This post may offer another option to consider.

The scales I've been working with the last several years are the A&D "GF" series (200, 200P, 200N ,300, 300P, 300N & 400 models). I've only seen them mentioned a couple times here but not recently.

They seem to be a version or two older than the FX-120i, BUT performance wise they are VERY similar to the FX series:
  • 0.001g/0.02grain readability
  • ~1s stabilization times
  • magnetic force reduction technology
  • * Supports grains (special note on the "P" & "N" versions below)
  • Support an older (but functional!) 25 pin serial/RS 232 port.
    With the correct adapter they can be connected to an auto trickler (they output the same data format as the FX series).
I have a GF-200P and a GF-400 balance. I'm no balance/scale expert, but both do their job well, and I picked up each for very reasonable prices.

There ARE couple smallish things to note with the "P" (pharmacy) and "N" (ntep) versions of the GF series:
  • The factory configuration may not include the Grain unit on the "P" & "N" versions. BUT there is a "maintenance" manual for the GF series that shows how to easily get to the factory settings and enable ANY unit, including grains.
  • Secondly, the "P" & "N" versions also only send data out to the serial port down to 0.01g or 0.1 grains. This means the "P" & "N" versions are not the best option for use with an auto trickler or diy trickler setup (this is why I have a GF-400 now).
    As far as I can tell this is because these versions are certified for "trade" down to 0.01g rather than 0.001g. I have a note into A&D about being able to change the output to the serial port, but no luck getting a response yet.
I've seen the GF balances on ebay in the $100-200 range. Of course there are some listings out there for quite a bit more, BUT from what I've seen, these scales are not selling fast. I've worked with a couple sellers on offers for less than half of what they are asking in their listings.

I will offer my standard caveats when dealing with any used equipment and ebay in particular:
  • If dealing with ebay, be smart (and for those that don't want to deal with ebay I get it).
    Its a good idea to look at scales that include a power adapter, power on and don't have a strange error code (although the maintenance manual DOES provide all the info on how to deal with different error codes, IF someone is so inclined to dig into it).
  • Don't be afraid to make an offer on higher listings, you'd be surprised what some sellers may take (like I said, I've had offers for less than half of asking price)
The GF balances also show up at various laboratory/pharmacy surplus sites for semi-reasonable prices. I never got around to dealing with those sites though, so I can't comment on how reliable they are to purchase from. Maybe someone else can offer experience here.

Anyway, that was a lot of words for a first post here (or anywhere) so thanks for reading it this far! Hopefully this gives some folks an option to consider if they are interested in shopping for a deal on a precision scale.
 
I appreciate the review and extra info--Always welcome !!!
I went through some cheapo units--was really looking for this type of info--In the end I got lucky on some unexpected income and went with the FX120i arrived FAST--Pro company --The unit is amazing!!! Fun part is I get to check my cheapo scales and see just what I was really getting--Now that has been interesting--my cheap Hornady $60 unit when used right, zeroed, etc was pretty darn close--surprising
Thanks--any new input here is great--Thank you for taking the time
 
Hey all, first post, but it looks like there is a bit of interest in precision scales/balances here on Accurate Shooter. I wanted to share some experience I've had digging around for budget options for precision digital scales/balances.

I'll be the first to say most folks, if budget allows, should hit the easy button and pick up the FX-120i or other high quality scales from reliably retailers.

However, I'd bet some other folks are on a bit more of a budget and/or enjoy doing a little deal shopping. This post may offer another option to consider.

The scales I've been working with the last several years are the A&D "GF" series (200, 200P, 200N ,300, 300P, 300N & 400 models). I've only seen them mentioned a couple times here but not recently.

They seem to be a version or two older than the FX-120i, BUT performance wise they are VERY similar to the FX series:
  • 0.001g/0.02grain readability
  • ~1s stabilization times
  • magnetic force reduction technology
  • * Supports grains (special note on the "P" & "N" versions below)
  • Support an older (but functional!) 25 pin serial/RS 232 port.
    With the correct adapter they can be connected to an auto trickler (they output the same data format as the FX series).
I have a GF-200P and a GF-400 balance. I'm no balance/scale expert, but both do their job well, and I picked up each for very reasonable prices.

There ARE couple smallish things to note with the "P" (pharmacy) and "N" (ntep) versions of the GF series:
  • The factory configuration may not include the Grain unit on the "P" & "N" versions. BUT there is a "maintenance" manual for the GF series that shows how to easily get to the factory settings and enable ANY unit, including grains.
  • Secondly, the "P" & "N" versions also only send data out to the serial port down to 0.01g or 0.1 grains. This means the "P" & "N" versions are not the best option for use with an auto trickler or diy trickler setup (this is why I have a GF-400 now).
    As far as I can tell this is because these versions are certified for "trade" down to 0.01g rather than 0.001g. I have a note into A&D about being able to change the output to the serial port, but no luck getting a response yet.
I've seen the GF balances on ebay in the $100-200 range. Of course there are some listings out there for quite a bit more, BUT from what I've seen, these scales are not selling fast. I've worked with a couple sellers on offers for less than half of what they are asking in their listings.

I will offer my standard caveats when dealing with any used equipment and ebay in particular:
  • If dealing with ebay, be smart (and for those that don't want to deal with ebay I get it).
    Its a good idea to look at scales that include a power adapter, power on and don't have a strange error code (although the maintenance manual DOES provide all the info on how to deal with different error codes, IF someone is so inclined to dig into it).
  • Don't be afraid to make an offer on higher listings, you'd be surprised what some sellers may take (like I said, I've had offers for less than half of asking price)
The GF balances also show up at various laboratory/pharmacy surplus sites for semi-reasonable prices. I never got around to dealing with those sites though, so I can't comment on how reliable they are to purchase from. Maybe someone else can offer experience here.

Anyway, that was a lot of words for a first post here (or anywhere) so thanks for reading it this far! Hopefully this gives some folks an option to consider if they are interested in shopping for a deal on a precision scale.
I think your post was great! My thoughts on the fx-120i & it's popularity is that it is compatible with the autotricklers & supertricklers, other than that there are several good scales out there for the folks that dont need the powder dispensers
 

This has been a great scale and very reasonably priced

I've seen some chatter about the US Solid scales but yours is the first post I've seen from someone actually using them. Glad it's working well for you!
 
The factory configuration may not include the Grain unit on the "P" & "N" versions. BUT there is a "maintenance" manual for the GF series that shows how to easily get to the factory settings and enable ANY unit, including grains.
Hoping you might know a trick or two for these units?
I just got a GF, series unknown but pre 2013 going off the calibration sticker.
Have gone through the manual I found online ( 2014-2020 are all the same) and for turning units on and off I only have g, pc and pct.
Tried the programmable unit but in the menu under unit I don't have the ALT option where your meant to be able to program a custom unit.

Cheers,
 
Hoping you might know a trick or two for these units?
I just got a GF, series unknown but pre 2013 going off the calibration sticker.
Have gone through the manual I found online ( 2014-2020 are all the same) and for turning units on and off I only have g, pc and pct.
Tried the programmable unit but in the menu under unit I don't have the ALT option where your meant to be able to program a custom unit.

Cheers,

Interesting, i've never seen one with only those units in the unit menu.

There is a technical manual that shows you how to get into the service menu and add ANY unit you want (note this only makes them available in the standard unit menu, they still have to be selected in the standard menu to be used).


Start on page 26 to get into the menu.

1689010040341.png

Then jump to page 43 to select the units you want to enable.

1689010373581.png

I have my balances set to only have OZ, gn and g.
 
I'm like a previous post regarding the FXi120 scale in that it is comparable with the Autotrickler's and a lot of precision loaders are using that combination.
I have no doubts that other scales are as accurate and read to same weights, but the Autotrickler works with it and the others don't.
 
I never understood why many (not all) of these scales and dispensing scales use a 20-50 gram calibration weight, when most reloaders are throwing charges in the 2-4 gram range. Totally eludes me.
 
Interesting, i've never seen one with only those units in the unit menu.

There is a technical manual that shows you how to get into the service menu and add ANY unit you want (note this only makes them available in the standard unit menu, they still have to be selected in the standard menu to be used).


Start on page 26 to get into the menu.

View attachment 1457109

Then jump to page 43 to select the units you want to enable.

View attachment 1457112

I have my balances set to only have OZ, gn and g.
I got a AND GF_200 scales trying the settings but will not go into CHECK mode so frustrating and ideas no jumpers on the main board i need to set ? any help appreciated
 
Retail scales don't have jumpers.

To enter check mode, have the balance plugged in but turned off:

PXL_20230828_222126204~3.jpg

PXL_20230828_222126204~4.jpg

PXL_20230828_222126204~5.jpg

To enter the menu to adjust units:

PXL_20230828_222126204~6.jpg
 

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I’m looking to upgrade from a beam scale. Not spending $555 on an fx 120i. I am going to throw a charge and trickle up. I was looking at a creedmoor 925x for $250 but that is a stran gauge and as I understand doesn’t settle as quick. Would a gf series with a magnetic force reduction be better?
 
I never understood why many (not all) of these scales and dispensing scales use a 20-50 gram calibration weight, when most reloaders are throwing charges in the 2-4 gram range. Totally eludes me.
The output from strain gage and other systems tends to be very linear. When you calibrate at zero and say 100 grams the output will have some minor linearity (absolute) error at points between 0 and 100 grams. You will often see this as a linearity spec (Fx-120i @0.003 grams). This is done over the range to generalize and minimize the error over the scale capacity. Calibrating at less than full range may increase the accuracy from 0 to that point but can increase the error at higher weights.

As for reloading, the scale absolute accuracy is not an issue unless we are using multiple scales and trying to measure the same amount of material between the multiple scales. What is important when using one scale for reloading is precision (repeatability) since it is normally the only scale used.

In a lab environment a scale is chosen considering its precision (repeatability) and its absolute accuracy. The absolute accuracy is necessary because the scale may be determining the amount of some substance that will be measured on another scale.
 
I get to check my cheapo scales and see just what I was really getting--Now that has been interesting--my cheap Hornady $60 unit when used right, zeroed, etc was pretty darn close--surprising

Shortly after getting my FX120i, I came across a few left over rounds that had been loaded using my Parker tuned beam scale. I had lost track of the load data, so I didn’t know what the target charge weight was, but each one weighed exactly the same on the FX120i. It was only three or four rounds, so it was probably statistically insignificant, but I was pretty impressed.
 
In the lab I worked in we would rely on scale resolution and repeatability.
Not accuracy, just as a comparitor.
A Reference standard would be put on the scale, tared, swapped to a working standard or test weight and deviation recorded. This would be repeated as necessary.
Then a SMALL sensitivity weight would be added to verify sensitivity at that load.
Way back when, we would swing weights and record turning points.

With my EJ-54D2 I can change the cal value, like 10 gram cal on low range.
Linearity is no worse than a count from 1 to 10 grams (or grain equivalent) checked with some pretty darn good standards.
High range
Linearity-EJ54D2.jpg
Low Range calibrated @ 10 grams
EJ-54D2-10-gram.jpg

While "sameness" of a check standard has value, absolute "weight" (Mass corrected for local gravity) as verified with adequate standards might be needed if your favorite nickle is lost or spent :)
 
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