Fluke V3001 FC Wireless DC Voltage Module DC voltage meter measures up to 1000V DC and can wirelessly relay measurements to Fluke Connect enabled master units Works as a standalone meter or with the following (sold separately): Fluke 3000 FC DMM, Fluke Ti200/300/400 Infrared Cameras, PC via a Fluke pc3000 Adapter, and Fluke Connect Mobile app Logging function can record and save up to 65,000 readings