Request InfoPower Technology Inc.PTI began manufacturing power supplies for Helium Neon gas lasers in 1969. At that time HeNe power supplies were larger than a common breadbox. The first HeNe power supply by PTI was smaller than a tea cup and was built on the company founder's kitchen table. To this day PTI remains the oldest consistent manufacturer of power supplies for Helium Neon gas lasers. The L92 is a current regulated, switching mode, and dual input voltage power supply for operating helium neon lasers. Users may select either an AC input voltage range of 100 to 130VAC or 200 to 260VAC. 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