Using sensors to monitor pH levels, the LED display turn from green to yellow when the pH levels become elevated.

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Ms. LIZ MARTINS(ph)(Business Monitor International): We don't see a huge decline.

NPR: German Chancellor Merkel to Visit Bush

But Liz Martins(ph), head of Mideast Coverage for Business Monitor International, says Iran's economy is protected by oil exports.

NPR: German Chancellor Merkel to Visit Bush