Has anyone used electronic pocket scales for VTF?

Glad to hear yours isn't magnetic. Mine is so I thought I'd mention it.

"The tonearm pivoting should not effect the VFT (sic) at various heights." Umm, you'd better check your physics. :)

I like to retract my statement about the VFT at various heights. I use a homemade 14 inch carbon fiber tonearm (measuring from pivot to stylus tip) with Shure type III cartridge. My scale didn't detect the VTF changes when I varied the scale's altitude due to my tonearm high compliancy. The Shure cartridge is relatively forgiving on VTF. I use the scale to ensure the VTF within manufacture's limits then fine tune with listening test. I enjoy inexpesive vintage sound.

14" DIY carbon fiber tonearm? Sounds very cool. Have you posted any pics?

I substituted the steel arm tube from an Audio Technica broadcast tonearm with a graphite golf driver shaft. Note the lead strip covering the vertical movement pivot bearings, it acts as a damping device. The anti skating string device works well also.
http://www.geocities.com/nghiep16/Vinyl/Arm.jpg
http://www.geocities.com/nghiep16/Vinyl/Arm1.jpg
http://www.geocities.com/nghiep16/Vinyl/new.jpg

Wow, very resourceful. I'm not sure I understand the bearing concept of the new arm. Is it suspended? Resting on the lead(?) button beneath the arm tube? Or...?