Title: Don't Purchase this unit
Product review: Purchased the unit in October. In January, it quit working. The description of the error message in the user's guide says that "the unit has been damaged and will need to be returned for servicing." The company support dept. responded that the unit needs calibration which costs 1/3 the cost of the unit itself and that calibration is required every 1-12 months. If the unit is defective and the warranty is one year, why would you pay 1/3 the price to have the unit repaired? Since it is disposable, buy the $30 unit and throw it away when it stops working. this one is a ripoff.
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