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The Tamura puts out 2.5V (half the 5v supply) with zero field then it goes up for one field direction and down for the other, so it measures current both ways. Chris biases his op-amp to get rid of the negative current so it measures current one way only - also has a bit of gain so the 0-5V result fits the adc range to give better resolution. I would imagine the Hass product is pretty similar although I haven't looked up the specs.
By the way, nice job on the liquid cooled heatsink across the way, a thing of beauty!
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Sometimes I sits and thinks and sometimes I just sits.
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