Frequently Asked Questions

Which is better for beginners, the KM200s or the KM100 with case?

I’d recommend the KM200s for absolute beginners because the smart auto ranging mode eliminates the need to set a dial — it automatically detects and switches between AC/DC voltage, resistance, and continuity. The KM100 requires you to manually turn the rotary switch to the correct range, which can be confusing if you’re just starting out. That said, the KM100’s included carrying case makes it easier to keep everything organized, which beginners also appreciate.

Is the KM200s worth the extra money over the KM100?

In my testing, absolutely yes if you need True RMS accuracy — the KM200s gives you lab-grade readings on flickering circuits and aged wiring that the KM100 simply can’t match. The KM100 lacks True RMS, so it may misread non-sine wave signals from dimmers or old appliances. For basic household outlet checks and automotive battery tests, the KM100 is fine, but for any serious troubleshooting, the KM200s is worth the upgrade.

Which multimeter is safer for automotive battery testing?

Both are safe, but I trust the KM100’s double fuse anti-burn protection and CAT III 600V rating a bit more for automotive work. The KM200s is triple-certified CAT II 600V/CE/RoHS, which is still safe for car batteries, but the KM100’s extra fuse layer gives me more confidence when testing higher current circuits. Either one will handle a standard 12V car battery without issue.

Does the KM200s come with a carrying case like the KM100?

No, the KM200s does not include a carrying case — it only comes with the meter, 2x test leads, 2x AAA batteries, and a user manual. The KM100 includes a zippered carrying case that keeps the meter, leads, and probes organized in one place. If portability and storage matter to you, the KM100 has a clear advantage here.

Which multimeter has better accuracy for testing old wiring in my house?

The KM200s wins this hands down thanks to its True RMS capability — it accurately reads non-sine wave signals common in older homes with flickering lights or fluctuating loads. The KM100 is a standard averaging meter, so it can give false readings on distorted waveforms, potentially making you think a live wire is dead. For any house built before the 2000s, I’d strongly recommend the KM200s.

Can the KM100 measure AC current like the KM200s does?

No, the KM100 cannot measure AC current — it only tests DC current, AC/DC voltage, resistance, continuity, and diodes. The KM200s measures AC/DC voltage, resistance, diode, and continuity, but neither meter measures AC current directly. If you need AC current readings, you’ll need a clamp meter instead of either of these models.