I have used the original Keto-Mojo for over a year with no problem. I needed to order replacement strips. In the middle of the order process, I was notified that I could upgrade to the new style and save money. I would be required to mail back the old device or I would be charged full price. I was surprised that I received both the new device and strips, and the old strips. I was told that I should have actively cancel the order. I thought the replacement order was a replacement for the starting order, since the strips now were useless. Though I originally asked to return the unopened old strips for a refund, there was no response to that request. I went through the process of disabling the old device and enabling the new one. Then I tried to test m y ketone level with the new device. The strip did not take up blood. The second strip did not take up blood. I tried glucose strips. The first one took it up immediately. However, the reading was 130. I'm wearing a CGM which at the time read in the 80s. I tried to calibrate the new device using the calibration fluid included with the device. The strip would not take up the fluid. I'm using the old device.