To begin with the ANENG M109 Digital Multimeter 4000 count AC/DC Voice Broadcast Electrical Instruments Tester Auto Multimetro Profesional Meter is a battery-powered, auto-ranging, mini digital multimeter that boasts a 4000 counts LCD display.
With its Smart Voice Broadcast feature, this device is perfect for those who want quick and easy readings.

When put to the test the M109 proved to be a reliable and accurate tool for measuring both AC and DC voltages, as well as resistance and continuity. Its automatic ranging feature ensures that users get the correct range for their measurements, while its 4000 count display makes readings easy to read and understand. As a result of its small size and lightweight design, the M109 is a convenient tool for those who need to take measurements on-the-go.

It is worth noting that the M109's Smart Voice Broadcast feature only broadcasts in Chinese which may be a drawback for those who do not speak the language. However, this does not affect the device's overall functionality. One potential drawback is that the M109 may not be suitable for heavy-duty industrial applications, as its compact size and design may not be able to withstand harsh environments.

Overall the ANENG M109 Digital Multimeter 4000 count AC/DC Voice Broadcast Electrical Instruments Tester Auto Multimetro Profesional Meter is a solid choice for those who need a reliable and accurate tool for measuring electrical values. Its compact size and Smart Voice Broadcast feature make it a convenient tool for those who need to take measurements on-the-go. If you're in the market for a mini digital multimeter, the M109 should definitely be considered for your toolkit.