Stylus force digital scales


Digital scales from Clearaudio and others range from $200-500. Amazon has 'em for $20. Why cant I use one of these instead and save big bucks?
tbromgard
The Audio Additives gauge from Music Direct reads to three decimal places. I have found it to be accurate and consistent. It appears well made(china) and is only 79.99. Another benefit, battery requirements are triple A's not the high dollar watch type batteries.
Is that Audio Additives scale truly non-magnetic?

I have the identical one from Acoustic Sounds (provably made by the same manufacturer) and its magnetic and still needs taring when I put my cart hovering over the weigh scale area.
Philb7777, the audio additives scale is completely non magnetic. I double checked last night.