I’ve used AcousTech (a popular style sold under many different brand names), Cartridge Man, Clearaudio, Ortofon DS3. The clear winner for accuracy and dependability is the Ortofon DS3, Clearaudio second.
To elaborate further, the Ortofon and Clearaudio measure perfectly, but the Ortofon is easier to use due to a larger measuring area. I have also used a Riverstone which is mostly accurate, usually within 1/10 gram, but suffers I believe from having a separate attachment for the record level measuring area whereas the others are integrated into the chassis with less chance for deviation in measurement.
Based on all your kind replies I've decided to go with the Ortofon DS3, price not being a factor considering the potential hazards when handling cartridges.
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