Creative Continuity Tester Made For a Few Bucks


No multi-meter? For troubleshooting most household things, a continuity tester is extremely handy. And as it turns out, you can make your own from the dollar store for next to nothing.

[Carlyn] shows us how to make two different styles of continuity testers — a light up version using a bicycle light, or a buzzer version using one of those cheap window alarms. The leads are made of 1/8″ audio cables — and everything for both these testers cost less than $5 from their local dollar store. It’s a very simple build process that you can probably figure out just from this one photo, but [Carlyn] has also taken pictures of every step along the way.

Compared to building one of these out of components from Radio Shack, this method is much more MacGyver, and cheap! Hooray for taking advantage of mass produced consumer products!

Not functional enough? How about building a talking multimeter instead? No? Have you ever wanted two multi-meters in one? Say hello to the Mooshimeter!


  1. xeon says:

    One of the oldest hacks known to electric and electronic engineers.

  2. jooorn says:

    5$ about 15 PLN (polish zloty)
    In other words: I spend about 9 PLN on food everyday.

  3. Haku says:

    I’d be worried about testing anything other than cables with a DIY continuity tester like that, you wouldn’t want to put too high a voltage through a circuit and/or reverse voltage, potentially killing components in the process.

  4. Mental2k says:

    My multimeter borked itself a couple of months ago and I wanted to check I’d definitely cut all the traces on a bit of strip board. Improvised with an led, resistor and a couple of jumper wires on a breadboard. It’s a nice handy solution if you’re in a corner.

  5. Nowadays you can order a crappy multimeter for $10 online. Sure, it’s twice the cost of these things, but it’s a full multimeter, continuity tester mode included.

  6. Jedi says:

    ^^now, instead of the intended result of DLTR stock going up, Harbor Freight stock goes down, slightly?

  7. Arkid Arkid says:

    An LED and a damn resistor with 2 AA batteries would have been a better hack than this undeserved crap on hackday! WTF is this shit being posted here for.

  8. Thanks for posting this. I totally agree with many of the commenters here. Crazy simple, not the most correct circuit.

    I took over an electronics class mid-semester and many of my student don’t have access to a multimeter. In the fall that will be a required purchase. In the meantime, I wanted to show them how easy it is to solve the continuity tester problem without screwing the students on financial aid.

    The labs aren’t due until Thursday, but I’ve already got some turning testers that blow what I did away:

  9. Peter Magnusson says:

    I use the electronics of a “music birthday card”. Solder wires to the contacts and a pin of a DIP socket to the other end as probe tips. Wrap the circuit into tape or put it into a very small zip-loc bag.
    Sure, the music is annoying, but usually you stop it after the first second anyway.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s


Get every new post delivered to your Inbox.

Join 96,771 other followers