6-FUNCTION AUTO-RANGING DIGITAL
MULTIMETER
MODEL NO: MM01
Thank you for purchasing a Sealey product. Manufactured to a high standard, this product will, if used according to these
instructions, and properly maintained, give you years of trouble free performance.
IMPORTANT: PLEASE READ THESE INSTRUCTIONS CAREFULLY. NOTE THE SAFE OPERATIONAL REQUIREMENTS, WARNINGS & CAUTIONS. USE
THE PRODUCT CORRECTLY AND WITH CARE FOR THE PURPOSE FOR WHICH IT IS INTENDED. FAILURE TO DO SO MAY CAUSE DAMAGE AND/OR
PERSONAL INJURY AND WILL INVALIDATE THE WARRANTY. KEEP THESE INSTRUCTIONS SAFE FOR FUTURE USE.
1. SAFETY
1.1. GENERAL SAFETY
9 Perform a risk assessment of tasks to be carried out before using the meter.
9 Measurement category III is for the measurements performed on circuits directly connected to the low voltage installation. This meter
has been designed according to IEC-61010-1 concerning electronic measuring instruments with an overvoltage category (CAT III 600V)
and pollution degree 2.
9 Please ensure that these guidelines are followed to guarantee the optimal performance and safety of our meter and the user.
9 Follow all safety and operating instructions to ensure the meter is used safely and is kept in good condition. With proper use and care,
your digital multimeter will give you years of satisfactory service.
9 When using this multimeter, please observe all normal safety rules concerning protection against the dangers of electrical current, and
protection of the meter against misuse.
9 Full compliance with safety standards can only be guaranteed if used with the test leads supplied. If necessary, they must be replaced
with genuine Sealey leads and/or those with the same electrical ratings. Failure to do so will invalidate the warranty.
8 DO NOT use leads if damaged or if the wires are bared in any way. DO NOT carry meter by the probes or their leads.
8 DO NOT remove back cover. This item does not contain any serviceable components.
1.2. SAFETY
8 NEVER exceed the protection limit indicated in the specications for each range of measurement.
8 NEVER use the meter to measure voltages that might exceed 600V above earth ground in category III installations.
9 Always be careful when working with voltages above 60V DC or 30V AC RMS. Keep ngers behind the probe barriers while measuring.
9 Inspect test leads and probes for cracks, breaks or crazes in the insulation before using the meter.
9 Familiarise yourself with the application and limitations of the multimeter as well as the potential hazards.
9 This meter is designed to be used outdoors in dry conditions.
9 IF IN ANY DOUBT CONSULT A QUALIFIED ELECTRICIAN.
WARNING! USE EXTREME CAUTION WHEN WORKING WITH HIGH VOLTAGES.
8 DO NOT position the equipment so it is dicult to disconnect the probes.
9 When the meter is connected to a circuit, DO NOT touch unused meter terminals.
9 When the magnitude of the value to be measured is unknown, set the range selector to the highest value available.
9 Before commencing testing, follow instructions below and select the correct input sockets, function and range on the multimeter.
9 Before changing functions, disconnect the test leads from the circuit under test.
9 Keep ngers behind the probe barriers whilst measuring.
8 DO NOT test voltages above 600V - the circuitry of the multimeter may be destroyed.
WARNING! NEVER connect the multimeter to a voltage source / live circuit when the rotary switch is set to any other function apart
from voltage testing.
WARNING! NEVER perform resistance, transistor, diode or continuity measurements on live circuits.
9 Always discharge lter capacitors in power supplies and disconnect the power when making resistance or diode tests.
WARNING! Voltage checks on electrical outlets can be dicult and misleading because of the uncertainty of connection to the recessed
electrical contacts. Other means should be used to ensure that the terminals are not “live”.
8 DO NOT use the multimeter in a potentially explosive atmosphere.
8 DO NOT operate the meter unless the back cover are in place and fastened securely.
9 If any abnormal readings are observed, the multimeter must be checked out by an authorised technician.
9 When not in use, store the multimeter carefully in a safe, dry, childproof location out of direct sunlight. Storage temperature range is
-10 to 60°C (14°F to 140°F)
9 The user shall ensure that test probes are correctly selected in order to prevent danger. Probes shall be selected to ensure that
adequate barriers guard against inadvertent hand contact with live conductors under test and that probes have minimal exposed probe
tips. Where there is a risk of the probe tip short circuiting with other live conductors under test, it is recommended that the exposed tip
length shall not exceed 4mm. If there is a hot item or surface near the test area, ensure suitable PPE is used to protect body parts.
NOTE: The warnings, cautions and instructions referred to in this manual cannot cover all possible conditions/situations that may occur.
9 It must be understood that common sense and caution are factors which cannot be built into this product, but must be applied by the operator.
WARNING!: When Low Battery symbol appears, replace immediately. Low battery can cause incorrect readings.
Refer to
instructions
Electrical shock
hazard
Keep in dry area
protect from rain
Caution before
and during
connection
Original Language Version
© Jack Sealey Limited
MM01 Issue 1 19/05/25
1.3. PROBE ASSEMBLY OPERATION
9 If the probe assembly is used in a manner not specied by the manufacturer, the protection provided by the probe assembly may be
impaired.
9 The applicable measurement category of a combination of a probe assembly and an accessory is the lower of the measurement
categories of the probe assembly and of the accessory.
9 Inspect the probes for damage to ensure safe use.
2. INTRODUCTION
Intelligent multimeter automatically detects and selects the required test function, AC/DC, voltage/current, resistance and continuity. Features
data-hold, auto-power-o function, and a low battery indicator. Non-contact voltage detection (NCVD) enables one-handed use. 4000 Count
high precision measurements. Easy-to-read LCD and LED worklight. Conforms to EN 61010-2 CATIII 600V safety requirements for electrical
equipment for measurement, control and laboratory use.
3. SPECIFICATION
3.1. ENVIRONMENTAL CONDITIONS FOR USE
3.1.1. 600V CAT III, Pollution level: 2, Altitude <2000m
3.1.2. Working environment temperature and humidity: 0-40
o
C (<80% RH, not considered when <10
o
C).
3.1.3. ; Storage environment temperature and humidity: -10-50
o
C (<70% RH, remove the battery).
3.1.4. Temperature coecient: 0.1 accuracy/
o
C (<18
o
C or >28
o
C).
3.1.5. Measure the maximum allowable voltage between the ground: 600V DC or 600V AC RMS.
3.1.6. Conversion rate: circa 3 times/second.
3.1.7. Display: 3000 Counts LCD display, automatically displaying unit symbols according to measurement function gear.
3.1.8. Over range indication: The LCD will display “OL”.
3.1.9. Low battery voltage indication: When battery voltage is lower than normal operating voltage, will be displayed.
3.1.10. Input polarity indication: Automatically displays “-” symbol.
3.2. ACCURACY INDEX
3.2.1. Accuracy: + - (a% reading + digits).
3.2.2. Reference conditions: ambient temperature 18
o
C to 28
o
C, relative humidity not greater 80.
3.3. DC VOLTAGE
3.3.1. Input impedance: 10Mꭥ.
3.3.2. Maximum input voltage: 600V DC or 600V AC eectiv4e value.
3.3.3. Minimum measured voltage: 0.5V DC or 1V AC.
3.3.4. Frequency response: 50Hz - 60Hz True RMS.
MODEL: MM01
DC Voltage (Accuracy): Range: 4/40/400/600V, Resolution:
0.001/0.01/0.01/1V, Accuracy: ± (1% + 3
digits/ 1% + 3 digits)
Transistor Test: NO
AC Voltage (Accuracy): Range: 4/40/400/600V, Resolution:
0.001/0.01/0.01/1V, Accuracy ±(1.2% +5
digits/1.5% + 10 digits)
Hi-Impact Rubber Case: YES
DC Current (Accuracy): Range: 400mA, Resolution: 0.1mA,
Accuracy: ± (1.2% reading + 3 digits)
Digits x Height: 4 x 16mm
AC Current (Accuracy): Range: 400mA, Resolution: 0.1mA,
Accuracy: ±(1.5% + 3 digits)
Low Battery Indicator: YES
Resistance (Accuracy): 4KΩ /40KΩ /400KΩ (Ohm), Resolution:
0.001/0.01/0.1 (Ohm), Accuracy: ±(1.2% +
5 digits)
Battery: 2 x 1.5V AAA (supplied)
Resistance (Accuracy): Range: 4MΩ /40MΩ (Ohm), Resolution:
0.001M/0.01M (Ohm), Accuracy: ±(2% + 5
digits)
Information: Data-Hold, Auto-Power-O & Live
Test
Temperature (Accuracy): NO Size ( L x W x D): 142 x 92 x 38mm
Capacitance (Accuracy): NO Nett Weight: 0.156kg
Duty Cycle: NO Conformity: EN 61010-2
Continuity: YES
Diode Test: NO
Backlit/Torch: YES
Original Language Version
© Jack Sealey Limited
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3.4. ALTERNATING VOLTAGE
3.4.1. Input impedance: 10Mꭥ
3.4.2. Maximum input voltage: 600V DC or 600V AC eective value.
3.4.3. Maximum measured voltage: 0.5V DC OR 1V AC.
3.4.4. Frequency response: 50HZ - 60HZ True RMS.
3.5. RESISTANCE
3.5.1. Overload protection: 250V DC/AC
3.6. DC CURRENT
3.6.1. Overload protection: 250V/400mA safety tube.
3.6.2. Minimum measurement current: 0.5mA.
3.7. AC CURRENT
3.7.1. Overload protection; 250V/400mA safety tube.
3.7.2. Minimum measurement current: 0.5mA
3.8. BUZZER ON/OFF
3.8.1. Overload protection: 250V DC/AC
4. OPERATION
WARNING!: When Low Battery symbol appears, change
immediately. Low battery can cause incorrect readings leading to electric
shock or personal injury.
4.1. INSTRUMENT SYMBOLS AND CONTROLS
Item no. Function
1 Non-contact voltage detection
2 Work light
3 Active Display
4 Torch and NCV button
5 On/O and function selection.
6 Lock data and screen backlight
7 Current input terminal
8 COM input
9 V input terminal
2
1
3
4
5
6
7
9
8
Fig.1
On
reverse
Original Language Version
© Jack Sealey Limited
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4.2. AUTOMATIC MEASUREMENT MODE
8 DO NOT measure any voltage higher than the eective value of
600V DC or 600V AC to prevent electric shock or damage to the
instrument.
8 DO NOT apply a voltage exceeding the eective value of 600V DC
or 600V AC between the common terminal and the ground to prevent
electric shock or damage to the instrument.
4.2.1. In automatic mode device can automatically measure AC/DC
voltage, resistance and ON/OFF.
4.2.2. On start up, the unit sets to automatic measurement mode.
4.2.3. Connect the black test pen to the COM input socket and the red
test pen to the V input socket.
4.2.4. Use a probe to measure the voltage, resistance and short circuit point
of the circuit to be tested at both ends (in parallel with the circuit to
be tested).
4.2.5. At this time the LCD display will simultaneously display the
corresponding measured voltage and resistance values. When
measuring DC voltage, the display will simultaneously display the
voltage polarity connected to the red probe.
4.3. MANUAL MEASUREMENT MODE
4.3.1. On start up, the unit sets to automatic measurement mode.
4.3.2. Press SEL button to switch between DC voltage, AC voltage, resistance, ON/OFF, DC current and AC current.
4.3.3. When measuring DC voltage less than 0.5V, AC voltage less than 1V, the displayed resistance value may appear because the
minimum measured DC voltage of the unit is 0.5V and minimum AC voltage is 1V.
4.3.4. When measuring a low current circuit, in order to measure accurately, rst short circuit both probes and record the resistance of the
short circuit. After measuring the circuit resistance subtract the short circuit resistance value.
4.3.5. When measuring a high resistant circuit it will take several seconds for the reading to stabilise. This is normal with high resistance
measurements.
4.3.6. When the unit is open circuit or the resistance value being read is too large, the display will show “OL” indicating the value measured
is out of range.
4.4. NCV TEST (NON-CONTACT VOLTAGE DETECTION)
4.4.1. Briey press the NCV key and then place the top of the unit (see g.1.1 for location) close to the conductor. If AC voltage is sensed
the unit will display detected signal strength and a buzzer will sound an alarm.
WARNING!: Even if no indication is given, voltage may be present.
8 DO NOT rely on non-contact voltage detectors to determine if electricity or voltage is present. Detection can be aected by factors
such as socket design, insulation thickness and type.
NOTE: When a voltage is input, the buzzer will sound to indicate the presence of an induced voltage.
NOTE: External sources of interference such a motors, ash lamps etc. may suppress a non-contact voltage detection.
5. MAINTENANCE
NOTE: There are no user serviceable components in the unit other than the batteries. To remove/ replace the batteries, ensure the unit
is turned o and probes removed. Use a screwdriver to remove the battery cover (on rear face). Remove / replace the batteries, ret
the cover and ensure it is securely in place.
5.1. If any abnormality is observed with the meter and the test leads, it should be discontinued from use immediately and sent for repair.
5.2. Ensure it is not used until it has been checked and found to be safe.
5.3. When servicing the meter test leads, use only specied replacement parts.
5.4. To avoid electric shock or damage to the meter or user, DO NOT get the inside of the meter wet. Before cleaning or storing the meter
disconnect the test leads and any other connections.
5.5. Regularly clean the meter’s case using a damp cloth and mild detergent. Avoid using abrasives or solvents. If the input jacks are dirty
or moist, they may impact readings.
5.6. To clean the input jacks, turn o the meter and unplug all test leads from the input jacks. Remove any dirt from the jacks.
5.7. Use a fresh cotton ball dampened with cleaner or lubricant to clean each jack. The lubricant prevents moisture-related contamination
of the jacks.
6. END OF LIFE
6.1. When disposing of this item ensure you operate in accordance with local and national regulations. Also see and understand Footer
information below.
Original Language Version
© Jack Sealey Limited
MM01 Issue 1 19/05/25
Original Language Version
© Jack Sealey Limited
ENVIRONMENT PROTECTION
Recycle unwanted materials instead of disposing of them as waste. All tools, accessories and packaging should be sorted, taken to
a recycling centre and disposed of in a manner which is compatible with the environment. When the product becomes completely
unserviceable and requires disposal, drain any fluids (if applicable) into approved containers and dispose of the product and fluids
according to local regulations.
WEEE REGULATIONS
Dispose of this product at the end of its working life in compliance with the EU Directive on Waste Electrical and Electronic Equipment
(WEEE). When the product is no longer required, it must be disposed of in an environmentally protective way. Contact your local solid
waste authority for recycling information.
Note: It is our policy to continually improve products and as such we reserve the right to alter data, specifications and component parts
without prior notice.
Important: No Liability is accepted for incorrect use of this product.
Warranty: Guarantee is 12 months from purchase date, proof of which is required for any claim.
REGISTER YOUR
PURCHASE HERE
Sealey Group
Jack Sealey (EU) Ltd t/a Sealey Group, Farney Street, Carrickmacross, Co. Monaghan, A81 PK68 Ireland
Jack Sealey Ltd t/a Sealey Group, Kempson Way, Suffolk Business Park, Bury St Edmunds, Suffolk, IP32 7AR UK
01284 757500 sales@sealey.co.uk www.sealey.co.uk
MM01 Issue 1 19/05/25
