SINOTIMER N-72HZ AC Frequency Signal Indicator Square Turntable LED Digital Frequency Meter, N-72HZ tissue flotation water bath is invented by ✔ Great for Education &

✔ Great for Education & ExperimentationTeachers

It has a magnet installed for a hands free operation

For a regular galvanometer

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SINOTIMER N-72HZ AC Frequency Signal Indicator Square Turntable LED Digital Frequency Meter, N-72HZ tissue flotation water bath is invented by ✔ Great for Education &1. Built in screw wiring, safe and convenient to use, sturdy and stable structure, suitable for long time work 2. Can be used in electrical power, telecommunications, machine tools, shipping, textiles, printing, mining machinery and other industries signal indication, alarm signals, accident signals, etc 3. Professional and practical design, beautiful appearance, easy to carry and use 4. Made of plastic surface, durable and wear resistant 5. No signal