--- product_id: 316491826 title: "Signstek MESR-100 V2 Auto Ranging in Circuit ESR LCR Meter Capacitor/Low Ohm Meter Up to 0.01 to 100R, Support in Circuit Testing" brand: "signstek" price: "579.28 DT" currency: TND in_stock: true reviews_count: 5 category: "Signstek" url: https://www.desertcart.tn/products/316491826-signstek-mesr-100-v2-auto-ranging-in-circuit-esr-lcr store_origin: TN region: Tunisia --- # 100kHz sine wave test frequency 0.001Ω high resolution 80+ hours battery life Signstek MESR-100 V2 Auto Ranging in Circuit ESR LCR Meter Capacitor/Low Ohm Meter Up to 0.01 to 100R, Support in Circuit Testing **Brand:** signstek **Price:** 579.28 DT **Availability:** ✅ In Stock ## Summary > 🔧 Diagnose like a pro — never let a bad capacitor slip through! ## Quick Answers - **What is this?** Signstek MESR-100 V2 Auto Ranging in Circuit ESR LCR Meter Capacitor/Low Ohm Meter Up to 0.01 to 100R, Support in Circuit Testing by signstek - **How much does it cost?** 579.28 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/316491826-signstek-mesr-100-v2-auto-ranging-in-circuit-esr-lcr) ## 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 - • **Long-Lasting Power:** Runs over 80 hours on 2 AA batteries or USB power for uninterrupted diagnostics - • **Ergonomic & Portable:** Curved plastic case with 60° stand, perfect for on-the-go pros - • **Ultra-High Resolution:** Detects ESR down to 0.001 ohm for pinpoint capacitor health - • **User-Friendly Display:** 128x64 dot matrix LCD with embedded capacitor reference table for instant pass/fail - • **Precision at 100kHz Sine Wave:** Eliminates impedance noise for true ESR readings in-circuit ## Overview The Signstek MESR-100 V2 is a professional-grade ESR LCR meter designed for in-circuit capacitor testing using a clean 100kHz sine wave signal. With ultra-high 0.001Ω resolution and a clear dot matrix LCD featuring an embedded capacitor health table, it empowers electronics repair pros to quickly identify failing capacitors without desoldering. Powered by 2 AA batteries or USB, its ergonomic design and long battery life make it an essential, reliable tool for troubleshooting TVs, audio boards, and more. ## Description Using 100kHz to remove the impedance 1/(2*pi*F*C), the impedance will become small, and then we can measure the true series resistor value. A bad E-capacitor have larger ESR and create large ripple rather than filtering noise. Normally, a big capacitor is larger than 3 ohm. Therefore, we can measure the capacitor is bad, damaged or in good condition by using this theory. Because our ESR meter only applies less than 15mV DC or peak to peak on a good capacitor, as a result we can use it as in circuit test. Because this low testing voltage, it cannot turn on the semiconductor inside a circuit under testing. During repairing TV, LCD, Audio board, etc. we can in circuit testing the capacitor is good or not. Advantage of V2: 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 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. Specification: 1)Accuracy: Up to 1% (detail on above table) 2) High Resolution: 4 digit, or 0.001Ohm @ 1 Ohm range 3)Measuring voltage: 80 Hours Package 1x MESR-100 V2 2 x test clips Review: Works very well!! - Love this thing, but the leads slip around when trying to clamp them and they are very short they should be longer and have the ability to put tiny probes on as well!! 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. ## Features - manufacturer: Signstek - Item Trademark: SIGNSTEK - Item Category: Electric Circuit Testing Device ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00GYSFOM6 | | Best Sellers Rank | #100,640 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #15 in Ohmmeters | | Brand | Signstek | | Brand Name | Signstek | | Color | black | | Colour | black | | Customer Reviews | 4.4 out of 5 stars 689 Reviews | | Item Weight | 0.5 Pounds | | Item weight | 0.5 Pounds | | Manufacturer | Signstek | | Maximum Operating Voltage | 100 Volts | | Measurement Type | LCR Meter | | Min. Operating voltage | 15 Millivolts | | Minimum Operating Voltage | 15 Millivolts | | Model | US-171024-02 | | Number of Items | 1 | | Part Number | US-171024-02 | | Power Source | Battery Powered | | Power source | Battery Powered | | Specification Met | IEC 61010-1 | | Style | Modern | | Style Name | Modern | | UPC | 710219731090 | | Unit Count | 1 Count | ## Product Details - **Brand:** Signstek - **Colour:** black - **Item weight:** 0.5 Pounds - **Power source:** Battery Powered - **Style:** Modern ## Images ![Signstek MESR-100 V2 Auto Ranging in Circuit ESR LCR Meter Capacitor/Low Ohm Meter Up to 0.01 to 100R, Support in Circuit Testing - Image 1](https://m.media-amazon.com/images/I/61i9HAWQHGL.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 ### ⭐⭐⭐⭐⭐ Works very well!! *by T***T on 9 February 2020* Love this thing, but the leads slip around when trying to clamp them and they are very short they should be longer and have the ability to put tiny probes on as well!! ### ⭐⭐⭐⭐⭐ Classic Bench Tool That Every Electronics Repair Enthusiast Should Own *by E***X on 8 June 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 29 April 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 ## 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/316491826-signstek-mesr-100-v2-auto-ranging-in-circuit-esr-lcr](https://www.desertcart.tn/products/316491826-signstek-mesr-100-v2-auto-ranging-in-circuit-esr-lcr) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-09-04*