This capacitance resistance tester is built for accurate, fast ESR checks of capacitors and circuit boards using the capacitor manufacturer's preferred 100 kHz sine-wave test method. Key features and benefits True 100 kHz sine-wave measurement: Tests capacitor ESR using the industry-recommended waveform for reliable, manufacturer-consistent results. Wide range and high accuracy: Measures ESR from 0.001 to 100.0 Ω with up to 1% accuracy for precise diagnostics across a broad set of capacitors. Online (in‑circuit) testing: Supports in-circuit measurements on PCBs so you can check capacitors without desoldering, speeding diagnostics and repairs. Double terminal blocks: Two terminal blocks provide fast, stable connections for quick checks and simple repeated measurements. Fast operation: Designed for quicker testing compared to many battery-style testers—reduces troubleshooting time when verifying multiple components. Compatible with ESR meters: Use with a connected ESR meter for immediate readings and efficient workflow. Stable performance and added protection: Built to deliver consistent measurement stability and to help protect circuits during online testing. Who this helps Appliance technicians: Rapidly identify failed capacitors in power supplies, TVs, and household appliances without lengthy disassembly. Electronics engineers and technicians: Verify capacitor health during development, board bring-up, and failure analysis. Hobbyists and DIY repairers: Conveniently test components on boards and confirm replacements before installation. Practical use scenarios Troubleshooting a switching power supply: Quickly locate high-ESR electrolytics on a PSU board using in-circuit ESR checks to pinpoint the faulty caps causing ripple or instability. Repairing consumer electronics: Test capacitors on a TV or audio amplifier PCB in place to identify bad components and confirm replacements without desoldering. Quality checking during assembly: Verify ESR values on installed capacitors in prototype or small-batch builds to catch assembly issues early. What it does (function and performance) Measures internal resistance (ESR) of capacitors using a true 100 kHz sine wave per manufacturers’ test methods. Measurement range: 0.001–100.0 Ω, accuracy up to 1%. Supports online (in‑circuit) testing and connects to an ESR meter for rapid checks. Double terminal blocks for easy, reliable connections and faster testing throughput. This tester provides precise ESR measurement, efficient in-circuit testing, and practical connection features to streamline capacitor diagnostics in repair, development, and DIY environments.