get a little IR pointer thingee, at the top of the res (which is the highest part in the system) when water covers it, the beam will be diffused so much to give a negative result at the receiver. When there is no water there, there will be no diffusion, so the receiver will get the beam and return a positive result
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2x P3 1100's at 1400, Abit VP6, 2x Corsair 256mb PC150 sticks, 20gb 'cuda ATA-III, 2x 40gb 'cuda ATA-IV in raid 0. 20" Trinitron. No fans
2x 2400+ at 2288mhz (16.0 x 143), Iwill MPX2, 2x Kingmax PC-3200 256mb sticks, 4x 20gb 60gxp in Raid 5 on a Promise SX6000. Asus Ti4200 320/630. Cooled by Water
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