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This Watta-heater is copper nickel plated... could be close
to a Romanowski alloy
http://www.amazon.com/Lewis-N-Clark-Watta-Heater/dp/B0045E4DSW
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This one is chrome plated steel, should show no thermal anomaly
http://www.amazon.com/NORPRO-559-Immersion-Warming-Liquids/dp/B000I8VE68/ref
=sr_1_1?s=home-garden
Use both - side-by-side with the same power input to heat 250 ml of a liquid
(preferably a low pH liquid, say vinegar to provide protons) for a 2 minutes
- and measure the comparative heat rise. Be sure to stir.
Will the Watta-heater outperform?
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