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Big Brother Is Watching At The Pump - In a perfect world, you get what you pay for, but as we all know, that is not always the case. When it comes to gasoline, you trust that the retailer is pumping your Poncho full of Premium and not Regular. Well, most state and local government agencies want to make sure, so they take random fuel samples. Zeltex Corporation (www.zeltex.com) markets a portable fuel analyzer for this purpose. With a base price of $10,500, it's not practical for a hobbyist, but it's nice to know this technology is available.The ZX-101 offers automatic fuel selection to detect the type of fuel being analyzed. A Delron sensor head firmly positions the sample bottle into the instrument, and a two-piece optical filter tray provides extended service life. The ZX-101 features a warm-up time of less than one minute and an analysis time of only 20 seconds. A screen supplies the actual octane number, and a printout is available.