Robinair's 80212 Bluetooth Temperature Probes, with a wireless connection, allow you to read and track temperature from multiple vehicle air vent locations from your A/C machine. Before and after vent temperatures can be included in ACS Machine vehicle reports to verify and confirm service for both customers and insurance companies. Works with Robinair 37998 and AC1234-9 connected ACS machines as well as Robinair 34288NI, 34788NI, 34788NI-H, 34988NI and AC1234-4 ACS machines, if the machine has the Wi-Fi/Bluetooth dongle already installed (software update may also be required). Probes use a pre-installed CR2450 3-volt replaceable battery. Pack of 2.