--- product_id: 4478349 title: "Signstek MESR-100 V2 Auto Ranging in Circuit ESR Meter Capacitor Tester/Low Ohm Meter Up to 0.01 to 100R, Support in Measuring Capacitance Resistance Circuit" brand: "signstek" price: "448.48 DT" currency: TND in_stock: true reviews_count: 9 category: "Signstek" url: https://www.desertcart.tn/products/4478349-signstek-mesr-100-v2-auto-ranging-in-circuit-esr-meter store_origin: TN region: Tunisia --- # 0.01–100Ω ultra-wide ESR range Auto-ranging for seamless testing In-circuit dual terminal probes Signstek MESR-100 V2 Auto Ranging in Circuit ESR Meter Capacitor Tester/Low Ohm Meter Up to 0.01 to 100R, Support in Measuring Capacitance Resistance Circuit **Brand:** signstek **Price:** 448.48 DT **Availability:** ✅ In Stock ## Summary > ⚡ Diagnose like a pro—never let a bad capacitor slip through your circuit! ## Quick Answers - **What is this?** Signstek MESR-100 V2 Auto Ranging in Circuit ESR Meter Capacitor Tester/Low Ohm Meter Up to 0.01 to 100R, Support in Measuring Capacitance Resistance Circuit by signstek - **How much does it cost?** 448.48 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/4478349-signstek-mesr-100-v2-auto-ranging-in-circuit-esr-meter) ## Best For - signstek enthusiasts ## Why This Product - Trusted signstek brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Trusted by Repair Pros:** A classic bench tool ranked #3 in Capacitance Meters with 4.4-star reviews - • **Effortless Auto-Ranging:** No menus, no fuss—just connect and get precise readings instantly - • **Built-In ESR Reference Table:** Quickly compare readings against industry standards for confident diagnostics - • **Ultra-Wide Measurement Range:** From 0.01 to 100Ω covers virtually all capacitor ESR and low resistance needs - • **Pinpoint Faulty Capacitors Instantly:** In-circuit ESR testing saves hours of guesswork and desoldering ## Overview The Signstek MESR-100 V2 is a battery-powered, auto-ranging ESR and low ohm meter designed for in-circuit testing of capacitors and resistors. With a measurement range from 0.01 to 100Ω and dual terminal probes, it enables fast, accurate diagnostics without desoldering. Its built-in ESR chart and simple operation make it a must-have tool for electronics repair professionals and enthusiasts seeking reliable, time-saving troubleshooting. ## Description Signstek MESR-100 V2 Auto Ranging in Circuit ESR Meter Capacitor Tester/Low Ohm Meter Up to 0.01 to 100R, Support in Measuring Capacitance Resistance Circuit: desertcart.com: Industrial & Scientific Review: Classic Bench Tool That Every Electronics Repair Enthusiast Should Own - The MESR-100 may not look flashy compared to modern touchscreen test equipment, but it has earned a permanent place on my electronics bench. This is one of those classic tools that does a specific job very well, and if you work on electronics repairs, it's incredibly useful. The primary reason I use it is for troubleshooting capacitors. A capacitor can look perfectly fine and even measure close to its rated capacitance, yet still have excessive ESR that causes a circuit to malfunction. The MESR-100 makes it quick and easy to identify those problem components without a lot of guesswork. I've used it on power supplies, consumer electronics, and various repair projects where tracking down a failing capacitor would have been much more difficult with a standard multimeter alone. One of the best features is the ability to perform many measurements in-circuit. Instead of desoldering every suspect capacitor, I can often get a good indication of component health directly on the board. That saves a tremendous amount of time when troubleshooting. I also use it when selecting replacement components. When comparing capacitors from different manufacturers or evaluating parts from my component inventory, it's nice to have an easy way to check ESR and resistance characteristics before installation. It provides an additional level of confidence that the parts going into a repair or project are actually suitable for the job. Operation is refreshingly simple. There are no complicated menus or lengthy setup procedures. Turn it on, connect the probes, and start measuring. The auto-ranging works well, readings are easy to interpret, and the instrument does exactly what it was designed to do. While I own more advanced test equipment, the MESR-100 remains one of the tools I reach for most often during repair work. It's a classic piece of bench equipment that has stood the test of time because it solves a real problem quickly and effectively. If you repair electronics, troubleshoot circuit boards, refurbish equipment, or simply want a better way to evaluate capacitors, this meter is absolutely worth having. Simple, reliable, and extremely useful. Review: A Tool That Actually Tells Me Which Caps Are Bad (Without Guessing) - What Makes It So Useful (For Real Work) The biggest win for me is in-circuit ESR testing. I don’t have to desolder every capacitor just to check if it’s bad. I can probe directly on the board and get a solid answer in seconds. That alone saves a ton of time. It uses a ~100kHz test signal, which is important because it matches how capacitor ESR is actually measured in real applications . Why I Trust It More Than a Multimeter A regular multimeter might tell me capacitance—but that doesn’t tell the full story. This meter shows ESR (internal resistance), which is usually what actually fails in caps over time. Low ESR → good cap High ESR → bad cap (even if capacitance looks fine) That’s huge when troubleshooting unstable power supplies. Where It Helped Me Most I’ve used it for: Xbox PSU repairs (huge here) Motherboards and GPUs Old TVs / monitors Random SMPS boards It’s especially useful when I’m chasing intermittent issues or unstable voltage rails. Fast, Simple, and Repeatable No menus, no complicated setup: Touch probes → instant reading Auto-ranging handles everything Built-in ESR chart helps quick comparison It measures roughly 0.01–100Ω, which covers most real-world capacitor failures ## Features - Dual terminal, for fast and easy inspect general capacitor or resistor, a printed ESR table for fast check - Wide Measurement Range - Auto-ranging capacitor ESR and Low Ohm Meter ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00GYSFOM6 | | Best Sellers Rank | #32,648 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #3 in Capacitance Meters | | Brand | Signstek | | Brand Name | Signstek | | Color | Black | | Customer Reviews | 4.4 out of 5 stars 723 Reviews | | Item Weight | 8 ounces | | Manufacturer | Signstek | | Measurement Type | LCR Meter | | Min. Operating Voltage | 15 Millivolts | | Minimum Operating Voltage | 15 Millivolts | | Model | US-171024-02 | | Part Number | US-171024-02 | | Power Source | Battery Powered | | Style | Circuit Testers | | Style Name | Circuit Testers | | UPC | 710219731090 | | Unit Count | 1.0 Count | ## Product Details - **Brand:** Signstek - **Color:** Black - **Item Weight:** 0.5 Pounds - **Power Source:** Battery Powered - **Style:** Circuit Testers ## Images ![Signstek MESR-100 V2 Auto Ranging in Circuit ESR Meter Capacitor Tester/Low Ohm Meter Up to 0.01 to 100R, Support in Measuring Capacitance Resistance Circuit - Image 1](https://m.media-amazon.com/images/I/61i9HAWQHGL.jpg) ![Signstek MESR-100 V2 Auto Ranging in Circuit ESR Meter Capacitor Tester/Low Ohm Meter Up to 0.01 to 100R, Support in Measuring Capacitance Resistance Circuit - Image 2](https://m.media-amazon.com/images/I/51VZ+3CX3KL.jpg) ![Signstek MESR-100 V2 Auto Ranging in Circuit ESR Meter Capacitor Tester/Low Ohm Meter Up to 0.01 to 100R, Support in Measuring Capacitance Resistance Circuit - Image 3](https://m.media-amazon.com/images/I/516vYOun6ML.jpg) ![Signstek MESR-100 V2 Auto Ranging in Circuit ESR Meter Capacitor Tester/Low Ohm Meter Up to 0.01 to 100R, Support in Measuring Capacitance Resistance Circuit - Image 4](https://m.media-amazon.com/images/I/619Q6gunaHL.jpg) ![Signstek MESR-100 V2 Auto Ranging in Circuit ESR Meter Capacitor Tester/Low Ohm Meter Up to 0.01 to 100R, Support in Measuring Capacitance Resistance Circuit - Image 5](https://m.media-amazon.com/images/I/61xMwnmd6-L.jpg) ## Questions & Answers **Q: Is there a way to confirm it's v2 with sine wave and not v1?** A: In the description on my order it is listed as V2. On a scope, with the meter open circuit, the test waveform is a rounded square wave. When connected to a 100 ohm resistor, the waveform is more of a triangle wave. When connected to a capacitor, it is somewhere between a triangle and a sine wave. **Q: can this meter perform a leak test on motor start capacitors?** A: No. This meter is for one test only - ESR of a capacitor. It does not perform any other tests. **Q: Values in 35v and higher columns decrease as you go down, columns for 10,16,25v decrease, then go back up. is this a typo? hint: look for ".12"** A: Better to use on of the ESR charts you can find online, not the one printed on the case (whether it's right or wrong) **Q: what is better about v2 (version 2) of this MESR-100 meter for the extra $10 it costs over the original version?** A: Compare MESR100 old V1 and new V2 Improvement: For an extra $10 I would get version 2 which is what I have now. 1) Change square wave to sine wave 100 KHz, reduce square wave’s high frequency component, and affect the reading passing the test leads and capacitor. 2) Higher Resolution up to 0.001 ohm. 3) 128X64 dot matrix LCD, with more larger value display and information 4) Embedded 25V capacitor table at LCD, auto display the capacitor is good or bad reference to common 25V electrolytic capacitor. 5) New plastic case, curve design for hand carrying. New stand for 60 degree stand on desk. 6) Use 2X AA battery, more convenience and longer battery life than 9V battery. 7) Support external USB power, using standard micro-USB port. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Classic Bench Tool That Every Electronics Repair Enthusiast Should Own *by E***X on June 8, 2026* The MESR-100 may not look flashy compared to modern touchscreen test equipment, but it has earned a permanent place on my electronics bench. This is one of those classic tools that does a specific job very well, and if you work on electronics repairs, it's incredibly useful. The primary reason I use it is for troubleshooting capacitors. A capacitor can look perfectly fine and even measure close to its rated capacitance, yet still have excessive ESR that causes a circuit to malfunction. The MESR-100 makes it quick and easy to identify those problem components without a lot of guesswork. I've used it on power supplies, consumer electronics, and various repair projects where tracking down a failing capacitor would have been much more difficult with a standard multimeter alone. One of the best features is the ability to perform many measurements in-circuit. Instead of desoldering every suspect capacitor, I can often get a good indication of component health directly on the board. That saves a tremendous amount of time when troubleshooting. I also use it when selecting replacement components. When comparing capacitors from different manufacturers or evaluating parts from my component inventory, it's nice to have an easy way to check ESR and resistance characteristics before installation. It provides an additional level of confidence that the parts going into a repair or project are actually suitable for the job. Operation is refreshingly simple. There are no complicated menus or lengthy setup procedures. Turn it on, connect the probes, and start measuring. The auto-ranging works well, readings are easy to interpret, and the instrument does exactly what it was designed to do. While I own more advanced test equipment, the MESR-100 remains one of the tools I reach for most often during repair work. It's a classic piece of bench equipment that has stood the test of time because it solves a real problem quickly and effectively. If you repair electronics, troubleshoot circuit boards, refurbish equipment, or simply want a better way to evaluate capacitors, this meter is absolutely worth having. Simple, reliable, and extremely useful. ### ⭐⭐⭐⭐⭐ A Tool That Actually Tells Me Which Caps Are Bad (Without Guessing) *by J***. on April 29, 2026* What Makes It So Useful (For Real Work) The biggest win for me is in-circuit ESR testing. I don’t have to desolder every capacitor just to check if it’s bad. I can probe directly on the board and get a solid answer in seconds. That alone saves a ton of time. It uses a ~100kHz test signal, which is important because it matches how capacitor ESR is actually measured in real applications . Why I Trust It More Than a Multimeter A regular multimeter might tell me capacitance—but that doesn’t tell the full story. This meter shows ESR (internal resistance), which is usually what actually fails in caps over time. Low ESR → good cap High ESR → bad cap (even if capacitance looks fine) That’s huge when troubleshooting unstable power supplies. Where It Helped Me Most I’ve used it for: Xbox PSU repairs (huge here) Motherboards and GPUs Old TVs / monitors Random SMPS boards It’s especially useful when I’m chasing intermittent issues or unstable voltage rails. Fast, Simple, and Repeatable No menus, no complicated setup: Touch probes → instant reading Auto-ranging handles everything Built-in ESR chart helps quick comparison It measures roughly 0.01–100Ω, which covers most real-world capacitor failures ### ⭐⭐⭐⭐ excellent, but leads too short *by W***I on January 20, 2026* Works well to identify defective capacitors. As many people have said, the leads are not just too short, they are tied to close to one another. The leads need another 4" and the separation needs to be another 2" to be able to get to awkward connections. ## Frequently Bought Together - Signstek MESR-100 V2 Auto Ranging in Circuit ESR Meter Capacitor Tester/Low Ohm Meter Up to 0.01 to 100R, Support in Measuring Capacitance Resistance Circuit - Lesnow solder wick braid 10ft Length Desoldering Wick Braid Remover Tool Solder Sucker 1 piece No-Clean soldering Wick Wire Roll and Disassemble Electrical Components - YIHUA 929D-V Electric Desoldering Soldering Iron Solder Sucker Desoldering Pump with Shorter Charging Handle and Desoldering Nozzles 1.0mm 1.2mm for Through-Hole Desoldering --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/4478349-signstek-mesr-100-v2-auto-ranging-in-circuit-esr-meter](https://www.desertcart.tn/products/4478349-signstek-mesr-100-v2-auto-ranging-in-circuit-esr-meter) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-07-09*