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Just picked up the CEN-TECH CM300 from Harbor Freight? This multimeter is a budget-friendly option, but its manual-ranging layout can be confusing, and some functions simply don't work (like the current measurement and the relative mode).

In this complete tutorial, I go over every single setting, explain how to properly use a manual-ranging meter, and give you an honest review of its accuracy and reliability for the price! If you're a beginner or need a breakdown of its confusing dial, this video is for you.

Video Timestamps & Key Topics: 💡
Meter Overview & Layout [00:48]: First impressions of the confusing dial, buttons (Hold, APO, Backlight), and overall design.

Leads, Ports, and Amperage Warning [03:59]: Understanding the common, VΩmA, and 10A ports and the critical time limit for high-current testing.

The Manual Ranging Mindset [05:14]: How to use the "microscope method" to start big and work down the dial to get the most accurate reading for any unknown value. 🔬

DC Voltage Measurement Example [06:45]: Practical application of finding and measuring DC voltage on the confusing scale.

AC Voltage & NVC (Non-Contact Voltage) [10:00]: How to safely test wall outlets and why the NVC feature is unreliable on this meter. ⚠️

Battery Testing & Load Test [12:48]: Why the meter's internal resistance changes to stress-test 9V and 1.5V batteries.

Current (Amps) Measurement [15:00]: Demonstrating current measurements in series and revealing which small-current functions on the meter are sadly broken. ❌

Capacitance Measurement [20:17]: How to test and discharge a capacitor.

Continuity & Diode Test [21:00]: Switching between continuity (for checking shorts) and diode testing.

Resistance (Ohms) Measurement [22:28]: Using the manual range for finding unknown resistance values.

The Relative Button [24:55]: Showing the intended function of the relative button and why it doesn't work on the CM300.

For just $20, the CEN-TECH CM300 is a decent entry-level meter, but know its limits!

SEO Optimization
Searching for a CEN-TECH CM300 review or Harbor Freight multimeter tutorial? This video is your full DIY guide on how to use the CEN-TECH 9-Function Digital Multimeter. Learn manual ranging multimeter basics, how to measure resistance (Ohms), DC voltage, and AC voltage. If you need to understand the CM300 dial or see an honest product review, this video covers the pros, cons, and which functions are reliable for your electrical testing and automotive troubleshooting.

Legal Disclaimer
DISCLAIMER: This video is for informational and entertainment purposes only. Please perform all electrical testing and maintenance at your own risk. Always prioritize safety, refer to the meter's official instruction manual before use, and never measure current in parallel with a voltage source. We are not responsible for any personal injury or property damage that may result from following the procedures shown in this video. If you are uncomfortable performing any electrical measurement, please consult a certified professional.