Mouse over to zoom in

Multifunctional LCD GM328A Transistor Tester Diode Capacitance ESR Voltage Frequency Meter PWM Square Wave Signal Generator SMT Soldering

Multifunctional LCD GM328A Transistor Tester Diode Capacitance ESR Voltage Frequency Meter PWM Square Wave Signal Generator SMT Soldering

Price on the app only:

Already have TOMTOP APP

Scan the product's code to buy directly!

Note: Please update TOMTOP App to the latest version.


Download freely and enjoy extra offers!

Ship From:
  • China Warehouse
  • United States Warehouse
  • Germany Warehouse
Please select a warehouse
Usually will be shipped in business days hours
The request failed! Please try again.
Sorry, it seems that there are no available shipping methods for your location.Please contact us for further assistance.


Ship to

United States
Stock in: china


Please select a color

For each user order no more 5 item(s)

Special discount has ended

Please note each user for only 1 item(s)

Preorder Add To Cart Out of Stock

Arrival Notice

if the goods arrival in 90 days,we will inform you by email!


Arrival Notice

Notification Subscription Success!

if the goods arrival in 90 days,we will inform you by email!

Notification Subscription Failed!

Error appeared,Please try again later!

Arrival Notice

Buyer Protection

  • Full Refund If you don't receive your order
  • Full or Partial Refund , If the item is not as described Learn More >
Multi-functional transistor tester for automatic detection of NPN and PNP transistors, FET, diodes, dual diode, thyristor, SCR, automatic identification of the transistor pinout. It also can be used as square signal and PWM signal generator.

Digital LCD display for easy readings, can display measured data and graphics.
Rotary switch control, a key measurement for convenient use.
Main chip is the DIP, easy for electronic enthusiasts to DIY or update the main chip.
Use 9V battery(not included), can also use DC power(DC 6.8-12V).
Automatic shutdown, shutdown current is only about 20nA.
Automatically detects NPN and PNP transistors, FET, diodes, dual diode, thyristor, SCR, automatic identification of the transistor pinout.
Test NPN and PNP transistor common-emitter current amplification factor, the base-emitter threshold voltage, off the collector - emitter leakage current.
Support 2 resistors measurement, show its positive and negative, on-state voltage.
Resistance measurement maximum resolution 0.01Ω, can be measured up to 50MΩ.
Automatically test the pins of a component and show on the display.
Measure FET gate threshold voltage and gate capacitance.
For the following 2100Ω resistor while measuring its inductance measuring range from 0.01mH - 20H.
Can be used as signal generator and frequency meter: frequency range from 1Hz-2MHz and can generate 1%-99% PWM(pulse width modulation) signals.

Before measuring capacitance, the capacitor must be discharged, otherwise very likely damage the meter.

Display: 160*128 LCD
Power Supply: 1 * 9V Battery(not included); DC 6.8-12V  
Current: Approx. 30mA
Resistance Measurement: Max. 50MΩ
Resistance Resolution: 0.01Ω
Capacitance Measurement: 25pF~100mF
Capacitance Resolution: 1pF
DC Voltage Measurement: Up to 50V
Screen Size: 3.7 * 3cm / 1.45 * 1.18in
PCB Size: 7.8 * 6.2cm / 3.1 * 2.44in
Product Weight: 66g / 2.3oz
Package Weight: 69g / 2.45oz

Package List:
1 * Transistor Tester

English User Manual:


Post a new topic

Please note that TOMTOP Forums are a community for all communicating and getting help each other. There will be some enthusiastic friends participate in your discussions. Of course TOMTOP customer service (with tomtop customer service icon) response is guaranteed ,which is the same way you contact us at

open this forum in full page
Customer Reviews

Average Rating:


based on 11 Customer Reviews

  • 5 stars
  • 4 stars
  • 3 stars
  • 2 stars
  • 1 stars

Share your thoughts with other customers and get Tomtop Points, the first 5 reviews get DOUBLE Tomtop Points!

Write a Customer Review
  • By Linda

    March 8, 2020

    Hi, I must say that it is a beautiful gadget delivered to me on time, I will say it is good, and then it starts to configure everything that can provide accurate measurements, many of which are real.

    Is this helpful? (0) (0)

  • By Shauna

    March 8, 2020

    Really very useful, I did not expect it could be so useful to quickly test values of any component without resorting to the multimeter. Only the function generator does not give me a clean signal on the oscilloscope but otherwise a really useful addition to the Lab at a very low price. I will always have one with me.

    Is this helpful? (0) (0)

  • By Raymond

    March 6, 2020

    Recommended for everyone. A little helper for hobbyists, professionals and etc. Measured values are not super precise. However, it is sufficient to check whether a component is in working order or not.

    Is this helpful? (0) (0)

  • By Tina J.

    March 3, 2020

    The tester arrived within the specified delivery time. The display was not yet installed. Commissioning was easy after the assembly. The first component was recognized correctly. After studying the functions, everything was successfully tested by me. The GM328A is ideally suited for quickly finding out what component is in front of you. I can recommend the tester at any time.

    Is this helpful? (0) (0)

  • By Forrest

    March 3, 2020

    It is one of those things that simplify your life, not essential until you need it ... how boring to check old transistors in the drawers if in doubt they have working junctions. In my case fully functional in all its functions and corresponding to the description, the quality I would say more than good compared to the price.

    Is this helpful? (0) (0)

  • By James

    February 24, 2020

    I want to share the positive reviews from buyers. After the first test, all parameters (such as transistors) are displayed. The design is also very simple and easy to use. Recommend everyone to buy, because I also bought it because of good reviews.

    Is this helpful? (0) (0)

  • By Edith

    March 5, 2020

    The test function is normal and I will buy another one later.

    Is this helpful? (0) (0)

  • By Mary

    March 4, 2020

    Often and willingly it is planted and it is up to remove power to restore it. According to me still some software problem to solve. We hope for a future update.

    Is this helpful? (0) (0)

  • By Elizabeth

    February 27, 2020

    Item arrived as expected. Excellent component test with data display of the various components with representation of the various transistor terminals, diodes, etc. I'm only sorry that it broke perhaps because of my distraction, I tried capacitors without discharging them. I bought it back. Recommended for those who have no particular demands.

    Is this helpful? (0) (0)

  • By s***1

    August 7, 2017

    Thank you very much! No problem, very fast, good product. I recommend.

    Is this helpful? (0) (0)

  • By j***i

    April 13, 2017

    Thank you for your good products and service A+++++

    Is this helpful? (0) (0)

Top Sellers More>

Please activate your account first. We will resend the activation email to help you complete your registration.

Recently Viewed


TOMTOP use cookies to give you the best shopping experience. If you continue to use our services or create a new account, we will assume that you agree to our  Privacy Policy.

Tell us which product you want to Social Saving

Click the refresh verification code