MESR-100 High-Performance ESR & Low-Ohm Meter Why you need it Quickly identify failed or degrading capacitors and low-ohm faults on boards without removing components. The MESR-100 speeds up troubleshooting for TV, LCD, audio and other electronics repairs. Accurate in-circuit and online testing prevents unnecessary component removal and reduces diagnosis time. Portable and USB-powered (DC 5V) for convenient bench or field use. Key benefits Fast, reliable ESR readings let you pinpoint bad capacitors that cause power instability, noise, or failure. Low-ohm measurement capability helps verify resistors, ground connections, and short paths. Dual (double) terminal design simplifies connection and speeds repetitive checks. Large LCD delivers clear, easy-to-read results for efficient workflows. Main features and specifications Model: MESR-100 Measurement range: 0.001 to 100.0R (ohm) True 100 kHz sine-wave ESR measurement, matching capacitor manufacturer test methods Applies DC or peak-to-peak signal <15 mV to a good capacitor while measuring ESR Supports IN-CIRCUIT testing and online measurement without removing the capacitor Automatic range selection for quick measurements Large LCD for clear digital readout USB power supply: DC 5V for portable operation Functions include digital analysis, capacity selection, unknown capacitance measurement, adjustment capacitance, and cable capacitance measurement Performance and compatibility Designed for general-purpose capacitors and resistors; suitable for TV, LCD, audio board repairs and condenser testing. Uses a true 100 kHz sine stimulus for ESR readings that correspond to manufacturer test procedures. Low-voltage stimulus (<15 mV p-p or DC) is safe for in-circuit testing of most equipment. Practical use scenarios Repair shop troubleshooting: Quickly scan power supply filter capacitors on a TV main board in-circuit to identify high-ESR parts causing display instability. Audio amplifier service: Verify electrolytic capacitors and output stage low-ohm paths to eliminate hum or distortion issues without desoldering components. Field maintenance on LCD displays or other equipment: Use USB power and the MESR-100’s portable form to measure unknown capacitance and cable capacitance, and to confirm component health on-site. What it stands out for True 100 kHz sine measurement and very low measurement floor (0.001R) provide high-resolution ESR and low-ohm detection. In-circuit and online testing capability plus low test voltage minimize disruption to the device under test. Clear LCD and dual terminals make routine checks faster and easier for technicians. Technical reminder Use the MESR-100 according to standard safety and repair practices. The device applies a small DC or AC test signal (<15 mV p-p) when measuring ESR; follow manufacturer recommendations for in-circuit testing conditions.