Check the listing for details. Vatell Signal Conditioning Dual Channel HFM Amplifiers. Condition: Used. Listed at 199.00 USD. Up for sale Vatell Signal Conditioning Dual Channel HFM Amplifiers These amps are designed to boost the signal of both the heat flux and temperature outputs from our thin-film heat flux sensor the HFM, having one channel for each. Each channel has an independent gain and an output voltage range of up to 5V. For the HFM-6 have resistance temperature sensors, the Vatell amplifiers include a calibrated current source for interrogation so that the output is a user-friendly voltage signal. Please refer to the pictures provided as they are an Essential part of this listing and show more detail on the condition of the item. Only those items shown in the photos will be included in the auction. Photos are the actual item you will receive, unless stated otherwise. Cosmetic ConditionCosmetically, it does show some signs of use. Please see the photos for more detail.