{"product_id":"klein-tools-cl390-ac-dc-digital-clamp-meter-accurate-trms-testing","title":"Klein Tools CL390 AC\/DC Digital Clamp Meter - Accurate TRMS Testing","description":"\u003cp\u003eIn this review the Klein Tools CL390 is presented as a practical, professional clamp meter for electricians and serious DIYers who need reliable, multi-function electrical testing. The bottom line: its auto-ranging \u003cstrong\u003eTRMS\u003c\/strong\u003e measurements and integrated non-contact voltage tester in the clamp jaw make it a standout tool for capturing accurate AC\/DC current and voltage without fuss. Reviewers will find it especially useful when they need true RMS accuracy, a clear reverse-contrast display for dim conditions, and handy features like a test lead holder and included thermocouple.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuto-Ranging TRMS:\u003c\/strong\u003e Provides accurate readings on complex waveforms so measurements reflect true RMS values for AC and DC signals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated NCVT:\u003c\/strong\u003e Built-in non-contact voltage testing in the clamp jaw speeds up live-circuit checks without changing probes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide Measurement Range:\u003c\/strong\u003e Measures AC\/DC current, AC\/DC voltage, resistance, continuity, capacitance, frequency, duty cycle and diodes for broad diagnostic capability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Probe Included:\u003c\/strong\u003e Temperature measurements with the supplied thermocouple add an extra diagnostic dimension for HVAC and electrical troubleshooting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Visibility Display:\u003c\/strong\u003e Reverse-contrast LCD improves visibility in dim environments so readings remain legible on job sites.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConvenience Features:\u003c\/strong\u003e Test lead holder, data hold, Max\/Min and optional magnetic hanger support hands-free and efficient work.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe CL390 is aimed at electricians, field technicians, and competent DIYers who require a portable meter that handles both clamp-based current measurements and standard lead-based tests, with the added benefit of TRMS accuracy for non-sinusoidal loads. It is useful on residential, commercial and light industrial jobs where mixed AC and DC systems are present.\u003c\/p\u003e\n\u003cp\u003eThose who primarily need a screen readable in bright, direct sunlight or who want every niche feature of a lab-grade meter may want to compare other models, since the display is optimized for low-light visibility and customers report it can be hard to read in strong sunlight. Also, if only a basic multimeter is required, the CL390 is more capability than necessary.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAccurate \u003cstrong\u003eTRMS\u003c\/strong\u003e readings and auto-ranging simplify complex measurements.\u003c\/li\u003e\n\u003cli\u003eIntegrated non-contact voltage testing in the clamp jaw speeds safety checks.\u003c\/li\u003e\n\u003cli\u003eIncludes thermocouple, test leads with safety caps and a carrying case for job-site readiness.\u003c\/li\u003e\n\u003cli\u003eHigh-visibility reverse-contrast display makes readings easier in poor lighting.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDisplay can be difficult to read in bright sunlight, according to some users.\u003c\/li\u003e\n\u003cli\u003eAuto-power-off may interrupt long diagnostic sessions if not disabled or monitored.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunctionality\u003c\/td\u003e\n\u003ctd\u003eAC\/DC current via clamp, AC\/DC voltage, resistance, continuity, frequency, capacitance, diodes, DC microamps, temperature\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Range\u003c\/td\u003e\n\u003ctd\u003eUp to 400 A via clamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisplay\u003c\/td\u003e\n\u003ctd\u003eHigh-visibility reverse-contrast LCD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMeasurement Technology\u003c\/td\u003e\n\u003ctd\u003eAuto-ranging True Root Mean Squared (TRMS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNon-Contact Voltage\u003c\/td\u003e\n\u003ctd\u003eIntegrated NCVT in clamp jaw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Accessories\u003c\/td\u003e\n\u003ctd\u003eCarrying case, test leads with CAT III\/CAT IV safety caps, thermocouple, 3 x AAA batteries, instructions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConvenience\u003c\/td\u003e\n\u003ctd\u003eTest lead holder, Max\/Min, Rel\/Zero, Data Hold, optional magnetic hanger compatibility\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Klein Tools CL390 is a well-rounded clamp meter that pairs \u003cstrong\u003eTRMS\u003c\/strong\u003e accuracy with practical job-site features, making it a good value for electricians and serious DIYers who need reliable measurements across many functions. It is especially worthwhile when clampbased current measurement and non-contact voltage detection are common tasks, though users who work exclusively in bright sunlight should check screen visibility for their conditions.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this meter measure temperature?\u003c\/strong\u003e\u003cbr\u003eYes. The CL390 includes a thermocouple probe for temperature measurements in electrical and HVAC troubleshooting.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs non-contact voltage testing built in?\u003c\/strong\u003e\u003cbr\u003eYes. The NCVT function is integrated into the clamp jaw so you can check for live voltage without changing tools.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat safety accessories are included?\u003c\/strong\u003e\u003cbr\u003eThe meter ships with test leads that have CAT III\/CAT IV safety caps and comes in a carrying case with instructions and batteries.\u003c\/p\u003e","brand":"KLEIN TOOLS","offers":[{"title":"Default Title","offer_id":48184988074203,"sku":"B08DTDCG7T","price":99.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/615Qn01l3uL._SL1000.jpg?v=1769706743","url":"https:\/\/gearmusthave.com\/products\/klein-tools-cl390-ac-dc-digital-clamp-meter-accurate-trms-testing","provider":"GearMustHave","version":"1.0","type":"link"}