Scientech Technologies Pvt. Ltd. Offers Negative Ion Generator, Caddo 4091. Scientech Technologies Pvt. Ltd. Is an ISO 9001: 2000 certified company and is the manufacturer and supplier of test and measurement instruments. The Negative Ion Generator helps in removing smoke, dust and bacteria from the room air and thus increases oxygen intake. This generator also retains the freshness of fruits, flowers and vegetables intact and neutralizes the odour.