DL479. Single Display AC 600A True RMS HVAC/R Clamp meter. Features; Features; Functions; Functions; Standards; Standards; Includes; Includes; DownloadsBefore using this meter, read all safety information carefully. In this manual the word "WARNING" is used to indicate conditions or actions that may pose INSTRUCTION MANUAL. ENGLISH. DL479. AC 600A TRMS HVAC/R. Clamp Meter UEi shall not be liable for loss of use of the instrument or other.