The Fluke 320 series (323/324/325) economical True-RMS clamp meters feature a slim 34 mm jaw for cramped dense cable trays, with True-RMS technology delivering accurate readings for distorted current from variable frequency and non-linear loads. The entry-level 323 handles basic AC inspection for residential and property maintenance; HVAC-focused 324 adds temperature, capacitance and backlight for air conditioning service; top-tier 325 expands with DC current and frequency measurement for one-stop troubleshooting of PV and industrial VFD equipment. All models carry dual CAT IV 300 V / CAT III 600 V safety ratings for service entrance protection, IP30 dust resistance, auto power-off power saving and a 2-year factory warranty, cost-effective portable testers for entry-level electricians and maintenance technicians.