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Trustworthy measurements in harsh working environments
Keysight DM4-class portable digital multimeters are designed to withstand harsh working conditions, improve safety, and offer convenience in the palm of your hand, whether you are troubleshooting electronics or performing machinery installation and maintenance. Equipped with smart features like an integrated frequency counter and overvoltage protection, our Portable DMMs help you quickly detect issues and obtain accurate measurements in the field. Explore our most popular models to find the one that is best for your application. Need help selecting? Check out the resources below.
Long battery life
800 hours of battery life enable you to perform tests in the field without interruptions and downtime, ensuring reliable measurements and productivity.
Integrated frequency counter
Troubleshoot circuits with oscillating or varying signals, such as power supplies or communication devices, without the need for an additional frequency counter.
Overvoltage protection
Protect yourself and prevent damage to your DMM from high-voltage electrical hazards with CAT III 1000 V and CAT IV 600 V over-voltage protection.
Data logging capability
Continuously monitor and record measurements over an extended period, ideal for measuring voltage, current, or temperature fluctuations.
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Digits of resolution
3 ½ to 4 ½
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Maximum reading speed
5 readings/s to 40 readings/s
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Measurement functions
DCV and ACV, DCI and ACI, 2-wire Resistance, Frequency, Capacitance, Diode test, Continuity test, Temperature, Continuity test with visual and audio alerts
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Display type
OLED, LCD
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Battery life
8 hours to 800 hours
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Maximum measurable resistance
60 MO to 600 MΩ
Most popular configurations
Handheld Digital Multimeter, 4 Digit, IP67
Handheld Digital Multimeter, 4 ½ Digit
Handheld Digital Multimeter, 4½ Digit, IP67
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Frequently asked questions
The main purpose of a portable digital multimeter (DMM) is to provide convenience and flexibility for fieldwork, troubleshooting, and on-site diagnostics. Portable DMMs are compact, battery-powered, and designed for mobility, making them ideal for electricians, technicians, or engineers who need quick, reliable measurements in different locations. In contrast, a benchtop DMM prioritizes higher accuracy, stability, and advanced measurement features. Benchtop models are typically used in laboratories, R&D, or production testing, where precision, repeatability, and advanced analysis capabilities are more critical than portability.
Portable digital multimeters can serve as temperature data loggers. For example, Keysight portable DMMs can accept many different types of thermocouple sensors. There are accompanying PC or mobile software to perform data logging and temperature profiling.
Here are the steps to perform data logging with a DMM:
- Attach your preferred temperature probe to your handheld DMM
- Switch your measurement mode specifically for temperature measurement
- Connect your portable DMM to a PC or mobile phone software to establish control and connection
- Configure your data logging settings and start measurements
The low input impedance function in a portable DMM is designed to remove ghost or induced voltages from measurements. This function works by presenting low impedance across the leads to obtain a more accurate measurement. The low impedance reduces the possibility of false readings in areas where the presence of ghost voltages is suspected. These stray voltages are normally caused by capacitive coupling between energized wiring and adjacent unused wiring.
Key uses of the low impedance function:
- Ensure detecting actual voltages in live circuits instead of induced voltages
- Reduce picking up stray voltages in high electromagnetic interference environments
- Improve small signal measurements in sensitive circuits