The MESR-100 ESR Meter is a compact diagnostic tool used to measure the equivalent series resistance (ESR) of capacitors. It helps technicians and hobbyists quickly identify weak or faulty capacitors during electronics troubleshooting.
MESR-100 ESR Meter Overview.
What Is an ESR Meter?
An ESR meter measures the internal resistance of a capacitor.High ESR readings often indicate capacitor degradation and can signal that replacement is needed.
Unboxing the MESR-100 ESR Meter
Package Contents.
The MESR-100 package includes the ESR meter unit, test probes, and user manual. Everything needed for basic operation is included for immediate setup.
Battery Installation and Setup
Installing Batteries.
Install the batteries into the meter and reattach the battery cover.
Powering ON.
Once powered on, the device is ready for use.
Zero Calibration Before Testing
Zero Calibration Process.
Before measuring any capacitor, the meter should be zero-calibrated by shorting the probes together and pressing the zero button. This removes probe resistance for more accurate readings.
Testing 50V 680µF Capacitor
First Capacitor Test.
A 50V 680µF electrolytic capacitor is tested first. Its ESR value is measured against the ESR reference table.
Testing 35V 1000µF Capacitor
Second Capacitor Test.
A 35V 1000µF capacitor is then tested. Its ESR reading is compared with the expected range.
Testing 10V 1000µF Capacitor
Final Capacitor Test.
The final test is performed on a 10V 1000µF electrolytic capacitor. The ESR value is checked against the reference chart.
Comparing ESR Readings with Reference Table
ESR Table Comparison.
Each measured ESR value can be compared with the reference table. This helps determine whether the capacitor remains in good condition or requires replacement.
The MESR-100 ESR Meter is a practical and affordable tool for capacitor diagnostics and electronics repair. Its compact design and fast testing capability make it a valuable addition to any technician’s toolbox.
If you regularly use rechargeable batteries such as 18650 Li-ion cells, having a reliable charger is essential. In this review, we take a closer look at the LiitoKala Lii-600, a smart battery charger packed with advanced charging and testing features. We will cover its design, specifications, charging performance, operating modes, and overall user experience.
Overview of the LiitoKala Lii-600 smart battery charger ready for testing.
What is the LiitoKala Lii-600?
The LiitoKala Lii-600 is a smart battery charger designed for charging and testing rechargeable batteries including Li-ion and NiMH/NiCd batteries. It features 4 independent charging slots, allowing users to charge different battery types and sizes simultaneously.
This charger is ideal for users who frequently work with:
18650 / 21700 / 26650 Li-ion batteries
AA / AAA NiMH rechargeable batteries
DIY electronics and battery-powered devices
Key Features
1. 4 Independent Charging Slots
Each slot works independently, allowing you to charge different battery sizes and types at the same time.
2. Multiple Charging Modes
The charger includes four operating modes:
CHARGE – Standard battery charging
DISCHARGE – Controlled battery discharge
TEST – Battery capacity testing
REPAIR – Attempts to restore weak batteries
3. Adjustable Charging Current
Users can manually select charging current depending on battery size and condition.
4. LCD Information Display
The display provides detailed real-time information such as:
Battery Voltage
Charging Current
Capacity (mAh)
Internal Resistance
Temperature
Battery Percentage
Unboxing Experience
Unboxing the LiitoKala Lii-600 package contents.
Inside the box, the LiitoKala Lii-600 package includes:
1x LiitoKala Lii-600 Charger
1x Power Adapter
1x User Manual
The charger feels solid and well-built, with a modern touch-control interface and bright LCD screen.
Battery Testing Before Charging
Measuring battery voltage with multimeter before charging.
Before charging, we tested a Li-ion battery using a multimeter. The battery measured approximately 3.4V, indicating it was partially discharged and ready for charging.
Charging Process
Step 1 – Connect Power Supply
Connecting power adapter to the charger.
Insert the included power adapter into the charger.
Step 2 – Insert Batteries
Inserting Li-ion batteries into charger slots.
Place the batteries into any of the 4 slots.
Step 3 – Charging Indicator
Red LED indicates active charging status.
Once inserted:
Red LED = Charging in progress
Green LED = Fully charged / Charging complete
Each slot has its own independent LED indicator.
Channel Selection and Slot Control
The Lii-600 allows users to select individual channels:
CH1 = Slot 1
CH2 = Slot 2
CH3 = Slot 3
CH4 = Slot 4
This enables independent monitoring and settings for each battery slot.
Performance Review
Monitoring charging performance during battery test.
Charging Speed
The charger supports adjustable current settings up to high charging rates, making it suitable for both fast and safe charging depending on battery requirements.
Accuracy
Voltage and charging data shown on the display were consistent and accurate during testing.
User Experience
The touch controls are responsive, and the interface is easy to understand after a short learning period.
Overall, the LiitoKala Lii-600 offers a strong balance of performance, features, and affordability. Whether you need to charge, test, or maintain your batteries, this charger handles the job efficiently.
