The Klein Tools ET600 is an insulation resistance tester (megohmmeter) rated CAT IV 600V / CAT III 1000V for installation, troubleshooting, and preventive maintenance of electrical wiring and equipment. It generates 125V, 250V, 500V, and 1000V DC test voltages and measures insulation resistance up to 4000 MΩ. True RMS auto-ranging also measures AC/DC voltage up to 1000V and resistance to 400 kΩ. The 4000-count backlit LCD includes a bar graph, high-voltage warning icon, and auto power-off. Built-in stand and optional magnetic hanger enable hands-free use. Backed by Klein Tools' 1-year limited warranty.
What is an insulation resistance tester used for?
It tests the integrity of insulation on cables, motors, transformers, and other equipment by applying a high DC voltage and measuring leakage current. High resistance (MΩ or GΩ) confirms healthy insulation; low resistance indicates degraded or failing insulation — a preventive maintenance tool, not just a fault-finder.
What test voltages does the ET600 output?
Insulation testers typically offer selectable test voltages (250V, 500V, 1000V DC) for different insulation classes and cable ratings. Verify the specific output options on the product page.
How is this different from a standard continuity tester?
A continuity tester applies a few volts and confirms a circuit is complete or broken. An insulation tester applies hundreds of volts specifically to stress the insulation and reveal degradation that only shows up under high-voltage loading — failures that pass low-voltage continuity tests can fail here.
Who needs an insulation resistance tester?
Electricians testing motor windings before commissioning, facilities maintenance checking aging cable plant, HVAC technicians verifying compressor motor integrity, and industrial electricians performing preventive maintenance on high-voltage equipment.
What measurements besides insulation resistance can it take?
Most Klein insulation testers also measure standard AC/DC voltage and continuity — verify the full measurement set on the product page for this model.
# Klein Tools® ET600 Insulation Resistance Tester **Model:** `ET600` **Brand:** Klein Tools **Category:** Multimeter > The Klein Tools ET600 is an insulation resistance tester (megohmmeter) rated CAT IV 600V / CAT III 1000V for installation, troubleshooting, and preventive maintenance of electrical wiring and equipment. It generates 125V, 250V, 500V, and 1000V DC test voltages and measures insulation resistance up to 4000 MΩ. True RMS auto-ranging also measures AC/DC voltage up to 1000V and resistance to 400 kΩ. The 4000-count backlit LCD includes a bar graph, high-voltage warning icon, and auto power-off. Built-in stand and optional magnetic hanger enable hands-free use. Backed by Klein Tools' 1-year limited warranty. ## Specifications | Attribute | Value | |---|---| | Product Type | Insulation Resistance Tester | | True Rms | Yes | | Auto Ranging | Yes | | Voltage Range Ac | 1000V AC | | Voltage Range Dc | 1000V DC | | Resistance Range | 400 kΩ | | Low Impedance Loz | No | | Nist Calibrated | No | | Display Type | LCD | | Display Count | 4,000 | | Cat Rating | CAT IV 600V; CAT III 1000V | | Battery Type | 6 x AA | | Overall Length In | 7.93 | | Assembled Weight Oz | 22.4 | | Barcode (UPC) | 092644692420 | | Warranty | 1-year limited | ## What's Included - Tester unit - CAT III/CAT IV safety-rated test leads - Heavy-duty alligator clip test leads - Batteries - Carrying case - Instruction manual Source: https://www.jaspecs.com/klein-tools/multimeter/et600-klein-tools-insulation-resistance-tester/