In addition to the Tenma driver, I just finished writing a driver for the TEMPer usb temperature sensor. I found that much of the information on the Internet regarding linux drivers for this device was wrong. Perhaps they refer to a different version of the part. The usb device I received uses a customized HID chip. You can find the linux driver here. Note that this driver is based on the libusb user space library and is not a kernel level driver. The driver can be compiled either as a standalone program or as a library to your own application. Permissioning is handled with a udev rule file.