MESR100 ESR Capacitor Tester Ohm Meter Internal Resistance

The MESR100 ESR Capacitor Tester Ohm Meter is a compact, precise tool designed for quick in-circuit ESR and low-Ohm measurements. Crafted for electronics repair and testing, it helps you quickly determine whether capacitors are good or failing on power supplies, TVs, LCDs, audio boards, and other electronics. This meter uses a true 100 kHz sine wave to measure ESR, effectively removing capacitor impedance for an accurate read.

In practice, this means you can reliably test capacitors in-circuit with minimal disturbance to the surrounding circuitry. The device applies less than 15 mV (DC or peak-to-peak) on a good capacitor, enabling safe, in-circuit ESR testing without removing components. Dual terminals, a printed ESR reference table, and an included SMD clip make fast, accurate inspections easy during repairs or diagnostics.

Whether you are a hobbyist or a professional technician, the MESR100 helps you quickly verify capacitor health during TV, LCD, audio, and board repair projects. Its sturdy copper-plated surface resists corrosion, and the compact 14.5 × 8 × 3 cm body fits comfortably in a tool kit for on-the-go testing.

Benefits & Tips

• Use for in-circuit ESR testing to quickly identify bad or failing capacitors in power supplies and signal paths.
• Take advantage of the dual terminal design and SMD clip for fast, accurate testing on through-hole and surface-mount capacitors alike.
• Rely on the built-in ESR reference table for quick comparison and faster repairs on TVs, LCDs, and audio boards.

Product specifications

• Color: Black
• Measuring range: 0.001–100.0 Ω
• Accuracy: Up to 1% (0.000–1.000 Ω: 1% + 2 digits; 1.000–10.00 Ω: 1% + 1 digit; 10.00–100.0 Ω: 2% + 1 digit)
• High resolution: 4 digits, 0.001 Ω on the 1 Ω range
• Measuring voltage (TESTING VOLTAGE): < 40 mV RMS
• External power: 5V micro USB
• Operating current: 0.02 A
• Battery: 2 × AA 1.5 V (not included)
• Battery life: > 80 hours
• Display type: Digital
• Dimensions: ~14.5 × 8 × 3 cm (5.7 × 3.1 × 1.2 in)
• Weight: ~139.6 g (4.9 oz)
• In-circuit testing: Yes
• Included features: Dual terminal, printed ESR table, SMD clip
• Manufacturer/brand: meterk
• Certification: CE

Package includes:

• 1 × Capacitance Meter
• 2 × Test Clips
• 1 × SMD Clip
• 1 × User Manual

Warnings/Reminders

• Note: The Capacitance Meter is used for testing the internal resistance of the capacitor, not for testing capacitance value.
• Power off the circuit before testing and follow standard safety practices when handling live electronics.

Language support

• Available languages: English

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