Marmonix MMU-P1 (MMUP1 / MMU P1) Pocket Digital Multimeter, 4000-Count True RMS

The Marmonix MMU-P1 (printed MMUP1 on the panel) is a True RMS pocket digital multimeter for electronics technicians, appliance and AC service engineers, students and anyone who wants a real meter in a shirt pocket. In a 127 g, 19.5 mm-thin body it measures AC/DC voltage to 600 V, resistance to 40 MΩ, capacitance to 9.999 mF and frequency to 9.999 MHz, plus duty cycle, diode and continuity, on a 4000-count display with auto or manual ranging.

The hinged cover protects the display and folds back to work as a stand, and the test leads clip into a channel at the side of the case, so the meter and leads go into your pocket together. See all digital multimeters, or read our practical multimeter buyer’s guide to check which features you need.

Why choose the MMU-P1 pocket multimeter

• True RMS AC voltage (40 Hz – 1 kHz): correct readings on non-sinusoidal supplies, which many pocket meters at this size do not offer.
• Wide capacitance range to 9.999 mF: checks motor-run and start capacitors, PSU filter caps and small electrolytics.
• Frequency to 9.999 MHz and duty cycle 1–99%: useful on PWM fan, LED and control signals.
• DC accuracy ±(0.5% + 4) on the 400 mV – 40 V ranges, ideal for batteries, sensors and electronics.
• Data hold and REL (relative) mode, auto/manual ranging and a fast continuity beeper (below 50 Ω).
• Built for carrying: 125 × 80 × 19.5 mm, 127 g, stand-up cover, stored leads, wrist strap and 15-minute auto power-off.
• CAT II 600 V with fused inputs, official datasheet and manual, and a 2-year Marmonix warranty.

What the MMU-P1 is used for

• Electronics and PCB repair: supply rails, resistors, diodes, capacitors and signal frequency
• Home appliance and AC service: socket voltage, compressor and fan capacitors, thermistors and continuity
• Automotive and batteries: 12 V / 24 V systems, battery health and fuse continuity
• Solar and UPS (low-voltage side): battery bank and DC-side voltage checks up to 600 V
• Education and labs: a safe, simple first True RMS meter for students

MMU-P1 specifications

Electrical specifications

Function	Range	Accuracy
DC voltage	400.0 mV / 4.000 V / 40.00 V	±(0.5% + 4)
DC voltage	400.0 V / 600 V	±(0.8% + 4)
AC voltage (True RMS, 40 Hz – 1 kHz)	400.0 mV – 400.0 V	±(1.2% + 4)
AC voltage (True RMS, 40 Hz – 1 kHz)	600 V	±(1.5% + 4)
Resistance	400.0 Ω – 4.000 MΩ	±(0.8% + 4)
Resistance	40.00 MΩ	±(2.0% + 4)
Capacitance	9.999 nF	±(5.0% + 20)
Capacitance	99.99 nF – 999.9 µF	±(2.0% + 5)
Capacitance	9.999 mF	±(5.0% + 5)
Frequency	99.99 Hz – 9.999 MHz	±(0.1% + 2)
Duty cycle	1% – 99% (0.1% resolution)	±(0.1% + 2)
Diode / continuity	Diode test; beeper below 50 Ω	—

Max input 600 V AC/DC. Accuracy values are taken from the official MMU-P1 datasheet; download the datasheet and user manual from the Downloads tab.

General specifications

Parameter	Value
Display	4000-count LCD, auto polarity, overload indication, ~3 readings/s
Ranging	Auto and manual
Functions	True RMS, data hold, relative (REL), low-battery warning, auto power-off after 15 min
Current ranges	None (voltage-type pocket meter)
Safety	CAT II 600 V, fused inputs
Power	2 × 1.5 V AAA (included)
Housing / size / weight	ABS, 125 × 80 × 19.5 mm, 127 g
Operating / storage	0–40 °C, <75% RH / −20 to 60 °C, <80% RH
Part number / GTIN	7603311 / 6298043998062
Warranty	2 years

How to measure with the MMU-P1

1. Inspect the test leads and insulation, then set the rotary switch to the function you need (V AC, V DC, Ω, diode/continuity, capacitance or Hz/%).
2. For voltage, touch the probes across the circuit; the meter auto-ranges, or press RANGE to fix a range.
3. For resistance, continuity or capacitance, switch off the power and discharge capacitors first; the beeper sounds below 50 Ω.
4. Press HOLD to freeze a reading in a tight spot, or REL to zero out lead resistance or compare against a reference value.
5. Remove the leads before changing function, and never exceed 600 V.

MMU-P1 vs MMU-112: which Marmonix multimeter?

	MMU-P1 (pocket)	MMU-112
Display	4000 counts	6000 counts
Max voltage	600 V AC/DC	1000 V DC / 750 V AC
Current	—	µA to 20 A AC/DC
Temperature	—	Yes
Safety rating	CAT II 600 V	CAT IV 600 V
Size / weight	Pocket, 127 g	Handheld
Best for	Electronics, appliances, sockets, PCB and battery checks	Panels, motors, HVAC and industrial work

Need current on a live cable? A Marmonix clamp meter measures amps without opening the circuit.

What’s in the box

1 × MMU-P1 main unit, 1 × test lead set, 2 × 1.5 V AAA batteries, 1 × wrist strap, user manual, warranty card and certificate of conformity.

MMU-P1 pocket multimeter: FAQ

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