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
Philb7777, the audio additives scale is completely non magnetic. I double checked last night.
After nearly 2 years use my Ortofon DS-3 has become unstable. Adjusting tare cannot solve the problem as it will not maintain zero and starts to display 0.01... 0.20 values. Anyone having the same issue... please advice. Thanks

@harold-not-the-barrel i have had similar issue from the start with DS-3, even my cheapest digitale scale was better that this Ortofon. I think all ortofons sucking enegry from the batteries too quick. However, my new DS-1 works fine for one year and i think it's better than DS-3. 

P.S. the problem with cheap digital scales and with mechanical scales is that all of them have different thickness, normally thicker than vinyl record, so they are incorrect, because the stylus is not leveled right.