5.5-digit multimeter

Precision Measurement for Bench and Lab Use
The ET3255 series Digital Multimeter is built for buyers who need dependable measurement tools for engineering, production, and service environments. As a true RMS dual-display Benchtop Multimeter, it delivers stable readings across a wide range of test tasks while supporting the day-to-day demands of Electronic Test Equipment setups. Its fresh, simple appearance also fits modern workspaces where clarity, order, and efficiency matter, making it a practical choice for teams that value consistent results and easy reading during frequent inspection and verification work.
Accurate Results Backed by Strong Hardware
This meter uses an STM32 chip with external dual-integral AD, giving it the processing foundation needed for accurate measurement and stable performance in professional test workflows. The 3.5-inch 320*480 high-resolution TFT LCD provides clear readings and rich display information, improving visibility during detailed checks and reducing the risk of misreading values. With full-function, full-range overload protection and AC-powered operation, it is designed to support reliable use in labs, production lines, and repair stations where measurement continuity and protection are essential. For teams comparing it with a 6.5 Digit Multimeter, Precision Digital Bridge, or LCR Meter, the ET3255 series offers a practical balance of precision, display quality, and operational stability.
Well-Suited for Test Stations, Maintenance, and Procurement Planning
The ET3255 series fits naturally into mixed test environments that also use a Programmable DC Power Supply, DC Electronic Load, or Multi-channel DC Power Supply, where measurement, verification, and system evaluation must work together. It is especially relevant for plant engineers, lab technicians, repair teams, and procurement teams seeking dependable Measurement Instruments that support routine validation, troubleshooting, and incoming inspection without unnecessary complexity. For distributors, resellers, and operations teams, this Electronic Test Equipment option stands out as a stable, easy-to-position solution for customers who need a professional Digital Multimeter with clear display performance and dependable long-term use.


Stable Measurement Structure
The ET3255 series is built as a true RMS Digital Multimeter with a 5.5-digit display class, STM32 control, and external dual-integral AD architecture, which supports accurate readings and stable operation in daily test work. For teams that rely on Measurement Instruments and Electronic Test Equipment, this structure reduces measurement drift and helps maintain consistent results across repeated checks, making it a practical choice for production lines, labs, and service benches where reliability matters.
Clear Display and Practical Protection
The 3.5-inch 320*480 TFT LCD gives clear readings and rich display information, which improves operator judgment and reduces the chance of misreading values during inspection. Full-function, full-range overload protection adds an important layer of safety for maintenance teams and equipment rooms, while AC power supply supports stable long-term use on a bench. This makes the unit well-suited for users comparing it with a Benchtop Multimeter, 6.5 Digit Multimeter, Programmable DC Power Supply, DC Electronic Load, Precision Digital Bridge, LCR Meter, or Multi-channel DC Power Supply in structured test environments.

Features
■ 55/6-bit resolution, maximum display digits 660,000;
■ Basic accuracy: 0.01%;
■ Maximum DC current 12A, maximum DC voltage 1100V;
■ Period and frequency measurement: Maximum frequency 20MHz
■ Additional functions: data retention, data storage, data readback;
■ True RMS AC voltage and AC current measurement, bandwidth up to 100kHz;
■ Capable of AC+DC measurement, duty cycle measurement, on-off and diode measurement;
■ Dual parameter display, can display two parameters of the same input signal (for example, in AC voltage measurement, can display AC voltage value and AC frequency value at the same time)
■ 12 basic measurement functions: AC/DC voltage, AC/DC current, two-wire/four-wire resistance, period, frequency, diode, continuity, limit test, duty cycle;
■ Mathematical functions: upper limit comparison, lower limit comparison, statistics (maximum value, minimum value, average value), reciprocal, relative, dB dBm percentage, MX+B
■ Square wave output: supports square wave signal output;
■ Capacitance function: Maximum 10mF capacitance measurement;
■ Trigger mode: automatic trigger, single trigger, external trigger;
■ Temperature measurement: 10 types of thermocouples: K/N/R/S/T/B/E/J/WRe325/WRe526, 4 Types of thermal resistors: PT100/PT50/Cu100/Cu50;
■ Measurement speed: fast, medium, slow;
■ Provide system settings, you can configure the language (Chinese or English), buzzer, screen brightness, and interface style adjustment;
■ Use 3.5-inch TFT wave crystal screen display (resolution 320*480), the screen brightness can be adjusted;
■ Communication interface: USB Device, RS232, support SCPI protocol;
General Specifications :
■ Power supply voltage: 220V AC±10% or 110V.AC±10%, 45-65Hz;
■ Working environment: 0~40℃, relative humidity <80%;
■ Storage environment: -10~50℃, relative humidity <80%;
■ Screen display: 3.5-inch TFT LCD screen, resolution 480×320, 16M colors;
■ Dimensions: 265mm*105mm*305mm (width*height*depth);
■ Product weight: 2.3kg;
Standard accessories :
■ 1 three-core power cord
■ 1 pair of three-core test leads
■ Backup power fuse
Optional accessories:
■ GPIB cable (32P01);
■ Cabinet mounting kit (32P02);
■ RS232 serial cable (32P04);
■ USB data cable (32P05).



Production Line and Incoming Inspection
In a factory production line or incoming inspection station, operators need to confirm voltage, resistance, and signal stability before parts move to the next process. The ET3255 series works as a Digital Multimeter and Benchtop Multimeter for fixed workstations, where clear display output and stable measurement structure help teams verify device performance without frequent recalibration checks during routine work. Its overload protection and AC-powered operation also fit bench-based inspection tasks that demand continuous use and controlled handling.

Laboratory and Equipment Maintenance
In a calibration room, repair bench, or instrument maintenance area, users often need a dependable tool to compare readings, diagnose faults, and document results for equipment such as a Programmable DC Power Supply, DC Electronic Load, Precision Digital Bridge, LCR Meter, or Multi-channel DC Power Supply. This meter suits those settings because it provides stable, high-visibility measurements for technicians who must trace abnormal values quickly and keep test records consistent across repeated checks, making it a practical part of professional Electronic Test Equipment workflows.



Q1. What measurement capability does this Digital Multimeter provide?
It is a true RMS dual-display Digital Multimeter with 5.5-digit resolution, designed for accurate and stable measurement. Our ET3255 series uses an STM32 chip with external dual-integral AD, and the display presents readings clearly on a 3.5-inch TFT LCD.

Q2. Is this unit suitable for bench testing and lab use?
Yes, the unit is well-suited for bench and laboratory environments where clear readings and stable performance are required. Our design uses AC power and full-function, full-range overload protection, which supports routine testing in measurement instruments and electronic test equipment setups.

Q3. How easy is it to read and operate during daily testing?
The 3.5-inch 320*480 high-resolution TFT LCD offers clear viewing, rich display content, and good visual effects. We built it with a fresh, simple appearance design so operators can check results efficiently during repeated test cycles on a Benchtop Multimeter.

Q4. Can this meter be used in measurement systems that need higher precision?
The meter is intended for accurate measurement and stable performance, with true RMS capability and dual-integral AD processing. For teams comparing it with a 6.5 Digit Multimeter or other precision tools such as a LCR Meter, we recommend matching the instrument to the required accuracy level and test task.

Q5. What power and protection features should operators expect?
It operates from AC power and includes full-function, full-range overload protection. That makes our meter practical for controlled test stations, especially where operators need reliable protection during electrical measurement tasks and consistent use across industrial test benches.