M ost 4000 series Kestrel Meters come in two versions, Non-Bluetooth and Bluetooth. Here is a simple way to determine if your meter has Bluetooth. Look at the LCD screen. In the black area surrounding the LCD readout, you will see the Kestrel name and bird on the top right hand side. If your meter has Bluetooth, in the top left corner of the black area there will be a Bluetooth logo . If there is no logo, then the meter you have does not have Bluetooth. If you look at the picture of the three meters together. The meters in the middle and right have Bluetooth.