Boyd,
I know nothing of the Adams Equipment scales however this past spring I purchased the Acculab VIC-123 scale shown on the page you posted the link. It appears to be a similar scale to the Adams Equipment scale with the same specifications. Note that this "123" model scale seems to be marketed under a number of different maker names.
My first comment is that
www.affordablescales.com is a great outfit to do business with. The company's real name is H&C of Columbia MD, and they are a large supplier of commercial weighing systems and willing to take time to talk on the phone with you.
I chose the Acculab VIC-123 for three reasons.
1. Others I know use this scale and recommend it. (I first learned of it from another shooter).
2. It comes with a double draft shield system, the hinged plastic cover and a glass ring shield that surrounds the pan.
3. The VIC-123 scale is specified to operate off a 11VDC-21VDC power source. (This is in the manual).
As shipped the scale comes with a 115VAC to 15VDC power module (no battery, the lower price reflects not having a rechargeable battery). While it is my intent to operate the scale in a trailer, at this point I do not have the trailer finished so have not tried to run the scale in a mobile operation at this point in time. However It is my intent to power it with a 12VDC "cigarette lighter" plug equipped power cord as the trailer is equipped with two 12V, 105AH "house" batteries complete with a SOLAR charging system.
As to operation presently, while initially purchased for re-loading .223 Rem shells, for the past 6 months, I've been using the Aculab VIC-123 for weighing 7 to 10 grain airgun pellets to .02gn resolution as part of a testing program of High precision PCP benchrest airguns and I find the scale to be very adequate and easy to use. Part of this is the speed with which this scale settles down with a new reading. I'm able to weight sort a tin of 500 pellets in a couple of hours time.
From the looks of the Adams Equipment scale on the page you posted the link to, the picture is hard to tell much about the draft shield as it is quite different as compared to the VIC-123 but looks very adequate. Having the rechargeable battery would be very nice for range use...
Happy Shooting,
Mitch & Shadow...