Has anyone used electronic pocket scales for VTF?

The 120 Z model is non magnetic. The VTF differences at various heights are due to the anti skating device. When the height changes, it either pulls the anti skating string or spring up or down hence changes the VTF. The tonearm pivoting should not effect the VFT at various heights.

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