Marmonix MMU-112 Professional Multimeter for Electricians
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MarMonix MMU 112 is a 6000-count True RMS digital multimeter with MAX/MIN recording, backlight, and protection case. Measures AC/DC voltage, current, resistance, capacitance, frequency, duty cycle, diode, continuity, and temperature. Compact, safe (CAT IV 600V), and ideal for electricians, students, and professionals.
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Description
The Marmonix MMU-112 is a full-size True RMS digital multimeter built for electricians, HVAC technicians, and maintenance teams who need trustworthy readings on modern loads—not just clean sine waves. A 6000-count backlit display, MAX/MIN recording, and a protective case with anti-broken bracket make it practical for panels, plant floors, and training labs.
Use it to check AC/DC voltage and current, resistance, capacitance, frequency, duty cycle, diode, continuity, and temperature. The CAT IV 600 V safety rating supports work closer to the service entrance when paired with correct leads and procedure. For selection criteria (True RMS, counts, and CAT), see our practical multimeter buyer’s guide or browse the full Marmonix multimeters range.
Key features
- 6000-count LCD with backlight
- True RMS AC measurement
- AC/DC voltage up to 1000 V DC / 750 V AC; current up to 20 A
- Resistance to 60 MΩ; capacitance to 9.999 mF; frequency to 9.999 MHz
- Temperature –20 °C to +1000 °C (with probe)
- MAX/MIN, relative, data hold, auto power-off
- Protection case and anti-broken bracket
- Safety rating CAT IV 600 V
MarMonix MMU 112 Digital Multimeter Specifications
| Function | Range | Accuracy |
|---|---|---|
| DC Voltage | 60.00 mV / 600.0 mV / 6.000 V / 60.00 V / 600.0 V / 1000 V | ±(0.5%+3) |
| AC Voltage | 60.00 mV / 600.0 mV / 6.000 V / 60.00 V / 600.0 V / 750 V | ±(1.0%+3) |
| DC Current | 600.0 μA / 6000 μA / 60.00 mA / 600.0 mA / 6.000 A / 20.00 A | ±(1.2%+3) |
| AC Current | 600.0 μA / 6000 μA / 60.00 mA / 600.0 mA / 6.000 A / 20.00 A | ±(1.5%+3) |
| Resistance | 600.0 Ω / 6.000 kΩ / 60.00 kΩ / 600.0 kΩ / 6.000 MΩ / 60.00 MΩ | ±(0.5%+3 to 1.5%+3) |
| Capacitance | 9.999 nF – 9.999 mF | ±(2.0%+5 to 5.0%+20) |
| Frequency | 99.99 Hz / 999.9 Hz / 9.999 kHz / 99.99 kHz / 999.9 kHz / 9.999 MHz | ±(0.1%+2) |
| Duty Cycle | 1% – 99% | ±(0.1%+2) |
| Temperature | –20 °C to +1000 °C / –4 °F to +1832 °F | ±(2.5%+5) |
| Diode/Continuity | Yes | — |
| Display | 6000 counts LCD with backlight | |
| Power Supply | Battery operated | |
| Dimensions | 180 × 90 × 45 mm | |
| Safety Rating | CAT IV 600 V | |
Typical use cases
- Electrical maintenance — voltage, current, and continuity on distribution and equipment circuits
- HVAC & industrial — temperature, resistance, and frequency checks on plant systems
- Automotive diagnostics — battery, charging, and capacitance checks
- Training labs — durable demo meter with a clear display for students
What’s in the box
- MMU-112 main unit
- Test leads
- Temperature probe
- 2 × AA batteries
- Warranty card
- Certificate of Conformity
Related reading: Multimeters · How to choose a multimeter
Buying guide: Read our digital multimeter buyer’s guide.
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