{"product_id":"klein-tools-mm420-digital-multimeter-trms-auto-ranging-600v-ac-dc-multimeter-lead-alert-measures-current-resistance-temperature-capacitance-and-continuity","title":"Klein Tools MM420 Digital Multimeter TRMS Auto Ranging 600V AC DC Multimeter Lead Alert Measures Current Resistance Temperature Capacitance and Continuity","description":"\u003cdiv style=\"font-family: Arial, sans-serif; color: #333333; line-height: 1.6;\"\u003e\n\u003ch2 style=\"color: #000000;\"\u003e\u003ca title=\"Link to Klein Tools homepage\" href=\"https:\/\/www.1toptools.com\/pages\/klein-tools\"\u003e\u003cimg style=\"display: block; margin-left: auto; margin-right: auto;\" alt=\"Klein promotional logo logout\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2274\/5945\/files\/KleinStacked-Black.png?v=1774018194\"\u003e\u003c\/a\u003e\u003c\/h2\u003e\n\u003ch2 style=\"color: #000000;\"\u003eElite Diagnostic Power: The Klein Tools MM420 Auto-Ranging TRMS Digital Multimeter\u003c\/h2\u003e\n\u003cp\u003eThe Klein Tools MM420 is a professional-grade, auto-ranging True Root Mean Square (TRMS) digital multimeter specifically engineered to provide superior accuracy and safety for electricians. Designed from the ground up by trade professionals, this versatile tester measures AC\/DC voltage up to 600V and current up to 10A, making it an essential instrument for residential, business, and light-industrial troubleshooting. With its high-contrast 4000-count backlit display, you can easily verify circuit integrity, analyze non-linear electrical loads, and perform precise diagnostics in even the most dimly lit environments.\u003c\/p\u003e\n\u003cp\u003eSafety and efficiency are at the core of the MM420 design, featuring an innovative \"Lead Alert\" protection system with LED illumination to ensure correct lead placement before every test. Beyond standard voltage and current, this robust meter measures resistance up to 50 MOhms, temperature via the included thermocouple, capacitance, and frequency. Built to withstand the rigors of a demanding jobsite, the MM420 features a durable housing drop-tested to 6.6 feet (2m) and a CAT III 600V safety rating. Whether you are balancing HVAC systems, testing motor windings, or certifying new electrical installations, the MM420 delivers the precision data required for peak performance and compliance.\u003c\/p\u003e\n\u003ch3 style=\"color: #000000;\"\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdvanced TRMS Technology:\u003c\/strong\u003e Automatically ranging True Root Mean Square measurement ensures laboratory-level accuracy on complex electrical signals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntelligent Lead Alert:\u003c\/strong\u003e Integrated LED illumination guides the user for correct lead placement, reducing the risk of circuit damage or user error.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComprehensive Testing Suite:\u003c\/strong\u003e Measures up to 600V AC\/DC voltage, 10A current, and 50MΩ resistance, plus temperature, frequency, and capacitance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Visibility Backlit Display:\u003c\/strong\u003e Features a clear 4000-count LCD screen optimized for readability in dark workspaces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial-Strength Durability:\u003c\/strong\u003e Ruggedized \"Tough Meter\" construction is drop-tested to 6.6 feet (2m) for lasting jobsite reliability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrician-Centric Design:\u003c\/strong\u003e Exclusively developed based on research and input from electrical professionals across America.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"color: #000000;\"\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e(1) MM420 Digital Multimeter\u003c\/li\u003e\n\u003cli\u003e(1) Set of Test Leads with CAT III\/CAT IV Safety Caps\u003c\/li\u003e\n\u003cli\u003e(1) Thermocouple with Adapter\u003c\/li\u003e\n\u003cli\u003e(2) AAA Alkaline Batteries\u003c\/li\u003e\n\u003cli\u003e(1) Owner's Manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ciframe width=\"1029\" height=\"579\" src=\"https:\/\/www.youtube.com\/embed\/pOouef1uqHM\" title=\"Klein Tools Digital Multimeters (MM325, MM420, MM450, MM720)\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003ch3 style=\"color: #000000;\"\u003eSpecifications\u003c\/h3\u003e\n\u003ctable height=\"471\" style=\"width: 44.2857%; border-collapse: collapse; margin-top: 10px; font-size: 14px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: #ffeef2;\"\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 40.966%;\"\u003e\u003cstrong\u003eVoltage Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 59.034%;\"\u003e600V AC \/ 600V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 40.966%;\"\u003e\u003cstrong\u003eCurrent Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 59.034%;\"\u003e10A AC \/ 10A DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffeef2;\"\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 40.966%;\"\u003e\u003cstrong\u003eResistance (Ohms)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 59.034%;\"\u003e50MΩ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 40.966%;\"\u003e\u003cstrong\u003eTemperature Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 59.034%;\"\u003e-40° to 1832°F (-40° to 1000°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffeef2;\"\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 40.966%;\"\u003e\u003cstrong\u003eCapacitance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 59.034%;\"\u003e400 µF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 40.966%;\"\u003e\u003cstrong\u003eSafety Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 59.034%;\"\u003eCAT III 600V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffeef2;\"\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 40.966%;\"\u003e\u003cstrong\u003eDrop Protection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 59.034%;\"\u003e6.6 ft (2 m)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 40.966%;\"\u003e\u003cstrong\u003eDisplay Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 59.034%;\"\u003e4000 Count Backlit LCD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffeef2;\"\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 40.966%;\"\u003e\u003cstrong\u003eOverall Length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 59.034%;\"\u003e6.41 in (16.3 cm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 40.966%;\"\u003e\u003cstrong\u003eOverall Width\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 59.034%;\"\u003e3.16 in (8.0 cm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffeef2;\"\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 40.966%;\"\u003e\u003cstrong\u003eOverall Height\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 59.034%;\"\u003e1.78 in (4.5 cm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 40.966%;\"\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 59.034%;\"\u003e8.2 oz (232 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #ffeef2;\"\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 40.966%;\"\u003e\u003cstrong\u003eUPC\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid rgb(221, 221, 221); padding: 8px; width: 59.034%;\"\u003e092644693748\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"margin-top: 20px;\"\u003e\u003cstrong\u003ePro-Tip:\u003c\/strong\u003e To maximize the life of your MM420 and ensure measurement accuracy, always verify the condition of your test leads before testing. If the \"Lead Alert\" flashes or your readings seem erratic, check the probes for oxidation or frayed wires. Regularly replacing your batteries will also prevent the low-voltage errors that can occur during high-resistance testing.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"KLEIN TOOLS","offers":[{"title":"Default Title","offer_id":51944155808055,"sku":"MM420","price":64.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2274\/5945\/files\/Klein_Tools_MM420_Digital_Multimeter_TRMS_Auto_Ranging_600V_AC_DC_Multimeter_Lead_Alert_Measures_Current_Resistance_Temperature_Capacitance_and_Continuity.jpg?v=1775833453","url":"https:\/\/www.1toptools.com\/products\/klein-tools-mm420-digital-multimeter-trms-auto-ranging-600v-ac-dc-multimeter-lead-alert-measures-current-resistance-temperature-capacitance-and-continuity","provider":"1 Top Tools","version":"1.0","type":"link"}