Your first multimeter – a simple buying guide 

 March 14, 2018

By  Peter

The multimeter is perhaps the most important test instrument in your lab.

If you are just starting out, it is easy to be confused, not knowing how to interpret the differences between the multitude of features that modern multimeters offer.

I’ll try to make getting your first multimeter easy for you. I would go for an auto-ranging multimeter, like the INNOVA 3320 Auto-Ranging Digital Multimeter. It is well priced for the features it has.

With auto-range, you don’t have to worry about worry about choosing the right scale for the measurement, your meter will figure it out automatically. It takes a bit longer for each measurement (still, less than a second) but saves you the hassle of playing with buttons and dials. Such meters also tend to be better made, with proper fuses and will last a long time.

As long as your meter can measure DC voltage and current, and has a continuity feature for testing short-circuits, you will be able to make 99% of the measurements you need around your Arduino.

NEVER try to measure mains with a multimeter unless you know definitely that the meter is designed for that and is properly fused. Minimum certification for AC mains measurements should be CAT IV.

If you are looking for a more high-end (and expensive) meter, look at the Tenma 72-7730A. It has very high accuracy, true RMS (good for AC measurements), you can connect it to a computer for remote measurements, has a data logger etc.

In our course The Electronics Workbench: A Setup Guide, you can learn how to use a multimeter, as well as other test instruments like the osciloscope and the signal generator.


Peter Dalmaris is an educator, electrical engineer, electronics hobbyist, and Maker. Creator of online video courses on DIY electronics and author of three technical books, and has recently released his book Maker Education Revolution.   As a Chief Tech Explorer since 2013 at Tech Explorations, the company he founded in Sydney, Australia, Peter’s mission is to explore technology and help educate the world.  Tech Explorations offers educational courses and Bootcamps for electronics hobbyists, STEM students and STEM teachers. A life-long learner, Peter’s core skill is in explaining difficult concepts through video and text. With over 15 years of tertiary teaching experience, Peter has developed a simple yet comprehensive style in teaching that students from all around the world appreciate.  His passion for technology and in particular for the world of DIY open source hardware has been a dominant driver that has guided his personal development and his work through Tech Explorations. Peter’s current online courses have helped over 60,000 people from around the world to be better Makers. 

Peter Dalmaris

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