Portable Precision Resistance Meters for Field and Lab
HIOKI Handheld Resistance Measurement Precision
The RM3548-50 Portable Resistance Meter with 0.2% accuracy combines lab-grade precision with robust, field-ready design. With battery operation, 10 resistance ranges from 3 mΩ to 3 MΩ, and support for temperature compensation, this instrument ensures stable, accurate measurements wherever you work.
Check out this reliable 4-terminal testing tool in a compact, portable format.
L2140
L2140 - 4-Terminal Test Lead Set for Extended-Reach DC Measurements
Key SpecificationsType: Four-terminal test lead set, red/blackMaximum rated voltage: 60 V DC Measurement type: DC resistance only (not suitable for AC impedance measurement) Red lead: 1.84 m, pogo-pin probe tip Ø 2.9 mm Black lead: 3.16 m, alligator clip for objects up to Ø 30 mm Contact pressure (pogo pin): Approx. 190 g initial, 250 g at 1 mm strokeConstruction: Four-terminal configuration; red and black leads not physically joined Compatible instruments: HIOKI RM3548-50, RM3548, and other DC four-terminal
resistance meters Detailed Product OverviewThe L2140 test lead set is designed for DC four-terminal resistance measurements, originally
developed for use with the HIOKI RM3548-50 portable resistance meter. It supports accurate
measurements across widely spaced test points, such as during EV and hybrid vehicle
maintenance, equipotential bonding tests, battery connection checks, motor winding
inspections, or resistance verification on industrial motors, transformers, and power supply
systems. The red lead features a straight, spring-loaded pogo-pin probe tip (tip diameter Ø 2.9 mm)
that provides stable contact on screws, busbars, or metallic terminals. The black lead is
equipped with a large alligator clip that securely grips objects up to Ø 30 mm, allowing
reliable connection to grounding points or wide conductors. Each lead pair is configured for four-terminal measurement, with separate SOURCE and
SENSE lines to minimize the influence of lead resistance and maintain measurement
consistency even when measuring over longer distances. The leads are not physically joined,
allowing flexible placement over several meters, which suits DC resistance measurement but
not AC impedance testing, where parallel cable routing is required to reduce inductive
effects. Rated for 60 V DC, the L2140 provides a sufficient safety margin for precision DC resistance
testing. Although originally designed for the RM3548-50, it is also compatible with the earlier
HIOKI RM3548 and with other instruments featuring compatible connectors. Its long and
flexible design also makes it suitable for test bench applications, for example with resistance
meters such as the HIOKI RM3545A.
L2141
L2141 - Rounded-tip pogo-pin test leads for four-terminal resistance measurement
Key SpecificationsType: Four-terminal test leads (red / black)Measurement type: DC resistance Tip type: Rounded gold-plated spring-loaded pogo pins (Ø 3.55 mm) Contact pressure: Approx. 1.2 kg at 4 mm stroke Lead length: 3.0 m (total, branch after 1.0 m; each lead 2.0 m) Construction: Four-terminal configuration (partly joined cable section) Compatible instruments: HIOKI RM3548-50, RM3548, and other DC four-terminal
resistance meters
Detailed Product OverviewThe L2141 test leads are designed for precise DC four-terminal resistance measurements
with the HIOKI RM3548-50 portable resistance meter. They feature rounded, spring-loaded
pogo-pin tips on both leads, providing stable and repeatable contact on metallic surfaces
without damaging the material. This makes the L2141 ideal for precision resistance
verification on clean or machined parts, such as bonding checks on metallic joints,
equipotential verification in aircraft and vehicle maintenance, and inspection of conductive
assemblies.Each lead pair is configured for four-terminal measurements, with separate SOURCE and
SENSE lines to minimize the influence of lead resistance and maintain consistent lowresistance readings. The gold-plated pogo-pin tips (Ø 3.55 mm) ensure excellent conductivity
and long-term durability, even during frequent measurement cycles. Each tip applies a
contact pressure of approximately 1.2 kg at a 4 mm stroke to maintain reliable electrical
contact on flat or even surfaces. The combined cable section allows convenient handling and reduces cable clutter during
operation, while the split tip section provides independent positioning of the probes on the
measurement surface. With a total length of 3.0 m, the L2141 offers sufficient reach for both
benchtop and field applications. The L2141 is suitable for DC resistance measurements on uncoated and sensitive metal
surfaces. For measurements through coatings or oxide layers, the L2142 puncture-pin type
leads are recommended. Although originally developed for the HIOKI RM3548-50, the L2141
is also compatible with the earlier RM3548 and other DC four-terminal resistance meters
featuring compatible connectors.
L2142
L2142 - Sharp-tip test leads for four-terminal resistance measurement
Key Specifications
Type: Four-terminal test leads (red / black)Measurement type: DC resistance Tip type: Sharp gold-plated spring-loaded pogo pins (Ø 3.55 mm)Contact pressure: Approx. 1.2 kg at 4 mm stroke Lead length: 3.0 m (total, branch after 1.0 m; each lead 2.0 m) Construction: Four-terminal configuration (partly joined cable section)Compatible instruments: HIOKI RM3548-50, RM3548, and other DC four-terminal
resistance meters
Detailed Product OverviewThe L2142 test leads are designed for precise DC four-terminal resistance measurements
with the HIOKI RM3548-50 portable resistance meter. In contrast to the L2141, they feature
sharp, spring-loaded pogo-pin tips on both leads, allowing stable contact by penetrating
paint, oxide, or other surface coatings to reach the conductive base material. This makes the
L2142 ideal for resistance verification on coated or oxidized metal parts, such as grounding
checks on painted frames, bus bars, or motor housings. Each lead pair is configured for four-terminal measurements, with separate SOURCE and
SENSE lines to minimize the influence of lead resistance and maintain consistent lowresistance readings. The gold-plated pogo-pin tips (Ø 3.55 mm) ensure excellent conductivity
and long-term durability, even during frequent measurement cycles. Each tip applies a
contact pressure of approximately 1.2 kg at a 4 mm stroke to maintain reliable electrical
contact on coated surfaces. The combined cable section allows convenient handling and reduces cable clutter during
operation, while the split tip section provides independent positioning of the probes across
wider measurement points. With a total length of 3.0 m and a branch after 1.0 m, the L2142
offers sufficient reach for both benchtop and field applications, even when measuring large
structures or widely spaced terminals. The L2142 is suitable for DC resistance measurements on painted or oxidized metal
surfaces where coating removal is not possible. For measurements on clean or machined
metal surfaces where coating penetration is not desired, the L2141 rounded-tip test leads are
recommended. Although originally developed for the HIOKI RM3548-50, the L2142 is also
compatible with the earlier RM3548 and other DC four-terminal resistance meters featuring
compatible connectors.
RM3548
RM3548 - Portable Resistance Meter
Handheld four-wire DC milliohm meter, test current range 500 nA to 1 A, ten resistance ranges from 3 mOhm to 3 MOhm
RM3548-50
RM3548-50 - Portable Resistance Meter
Handheld four-wire DC milliohm meter, test current range 500 nA to 1 A, ten resistance ranges from 3 mOhm to 3 MOhm, backlight display, optional Bluetooth communication
RM3548-50 – Precision Resistance Measurement on the Move
There are multiple reasons to use a special resistance meter. The portable four-wire DC milliohm meter RM3548-50 delivers reliable results when testing electric motors, transformers, cables, weld joints, and EV components offering 0.1 µΩ resolution, up to 1 A test current, and smart features like offset voltage correction, temperature compensation, and data storage. Discover in our blog why specialized resistance meters – whether portable or benchtop – are indispensable and which other HIOKI models are available.