Consumers should immediately stop using these meters. The consumers are asked to: Return these products to Fluke or Tektronix for a free software upgrade, or Download and install the upgrade code from the Fluke and Tektronix websites, depending from which company the product was purchased. For more information, consumers may contact Fluke toll-free at 1-888-973-5853 or visit the firm's website ; consumers may contact Tektronix toll-free at 1-800-833-9200 or visit the firm's website . Consumers may also view the recall notice on the [NJS_FILE:8938bd5d-9d57-4166-a983-ba1b1f802cc4:f398a2e1-9807-43ef-bb33-23a7c5bedba8]. Date modified: 2012-05-03