When should I use an AC milliohm meter instead of a standard digital multimeter?

Standard multimeters lack the resolution to measure extremely low resistances accurately. An AC milliohm meter uses a precise 4-wire measurement method to bypass lead resistance, making it essential for testing battery internal resistance in 18650 cells and lead-acid batteries.

What display count do I need for standard industrial troubleshooting?

A 6000-count digital multimeter provides the necessary resolution for most industrial diagnostics. True RMS capability is also critical, as it ensures accurate AC voltage and current readings on non-sinusoidal loads like variable speed drives.

How do I safely discharge high-voltage capacitors before servicing a circuit?

Never short a high-voltage capacitor with a standard screwdriver, as this causes dangerous arc flashes and component damage. Use a specialized capacitor discharge pen rated up to 1000V to safely dissipate stored energy through internal capacitive resistance.

Why should I select silicone-insulated test leads over PVC alternatives?

Silicone insulation remains highly flexible in cold environments and will not melt if it accidentally contacts a hot soldering iron. This durability makes silicone-banana probe cables the preferred choice for demanding industrial test benches and field service kits.

Test & Measurement

36 products available

Looking for professional test and measurement equipment to diagnose and maintain your electrical systems? Compel supplies industrial-grade test and measurement instruments designed for electronics manufacturing and high-voltage MRO operations. Our range covers everything from precision benchtop lab power supplies to portable digital multimeters and high-safety discharge tools.

We stock heavy-duty testing gear that stands up to daily industrial use. Sourcing your diagnostic tools from Compel ensures your technicians have access to highly accurate, calibrated instruments. Minimize downtime and verify circuit integrity with reliable components backed by our rapid regional distribution.

36 products in Test & Measurement

-24%

Test & Measurement

Smart Multimeter | 6000 Counts True RMS | Rechargeable AC/DC Voltage & Current Tester

TBS-01943TEST-00017

$52.99$69.61

WCH BLE AnalyzerPro development board for Bluetooth packet analysis, supporting BLE 5.0, 4.2, 4.1, and 4.0 protocols.

Test & Measurement

Bluetooth Protocol Analyzer | BLE 5.0 Development & Packet Capture Tool

TBS-01285TEST-00010

$63.99

Professional PCB SMT stencil for precise solder paste application, part of a complete circuit board design and manufacturing service.

Test & Measurement

PCB & SMT Stencil Service | Custom Keyboard & Circuit Board Design | Manufacturing Quote

TBS-00937TEST-00009

$21.95

10-piece set of mini single test hook clips with gold-plated probes for precise electronic testing and IC grabbing.

Test & Measurement

Test Hook & Probe Set | 10-Piece Mini Grabber Clips for Electronics & IC Testing

TBS-00581TEST-00001

$8.95

ANENG MH12 Digital Megohmmeter for testing insulation and earth resistance, featuring a high voltage cable tester and large LCD display.

-4%

Test & Measurement

Insulation Resistance Tester | High-Voltage Megohmmeter for Cable & Earth Testing

TBS-00582TEST-00002

$103.99$108.14

1000V Capacitor Discharge Pen, a high-voltage digital sparkpen for fast, safe discharging in electronic repairs and component testing.

-6%

Test & Measurement

1000V Capacitor Discharge Pen | High-Voltage Safety Tool for Electronics Repair

TBS-00597TEST-00003

$19.99$21.35

0.56 inch LED digital voltmeter and ammeter with shunt for car or motorcycle, measuring 0-100V and up to 100A current.

Test & Measurement

DC Digital Multimeter | 0-100V 10A-100A Range | LED Display for Automotive & Motorcycle Diagnostics

TBS-00612TEST-00004

$8.95

Adjustable Voltage Current Protector with digital volt meter for 80-300V AC/DC, featuring short circuit protection for single-phase power.

Test & Measurement

Voltage Protector | AC/DC Power Monitor with Short-Circuit Protection | 80-300V Range

TBS-00636TEST-00008

$29.95

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Selecting the Right Form Factor: Benchtop vs. Portable Instruments

Your choice between benchtop and portable instruments depends on your primary working environment. Benchtop equipment, like our 24MHz dual-channel function generators and 30V precision DC lab power supplies, delivers high-resolution signals and stable power for design and repair labs. Portable devices, such as touchscreen digital multimeters and battery internal resistance testers, offer the mobility needed for field diagnostics and on-site maintenance.

Benchtop Units: Best for continuous duty cycles, precise voltage regulation down to 0.01 V resolution, and multi-channel arbitrary waveform generation.
Handheld/Portable Units: Look for rechargeable batteries, high display counts like 6000 counts True RMS, and high-contrast digital displays for low-light industrial environments.

Matching Instrument Safety Ratings to Your Working Voltages

Industrial electrical testing carries inherent risks, especially when dealing with stored energy or high-voltage lines. When selecting insulation resistance testers, verify the test voltage range matches your cables and earth systems. For safe electronics repair, always use dedicated safety tools like a 1000V capacitor discharge pen to safely bleed high-voltage components before physical contact.

Low-Voltage Testing: Mini grabber clips and silicone-insulated test leads rated up to 600V are ideal for IC testing and circuit board diagnostics.
High-Voltage Insulation: Choose megohmmeters with selectable test voltages from 250V up to 5000V and resistance ranges reaching into the teraohm scale.
Power Monitoring: Inline voltage protectors should cover standard industrial ranges from 80V to 300V AC/DC to protect sensitive test setups from short-circuit damage.

Buying guide

Choosing Test & Measurement

When should I use an AC milliohm meter instead of a standard digital multimeter?: Standard multimeters lack the resolution to measure extremely low resistances accurately. An AC milliohm meter uses a precise 4-wire measurement method to bypass lead resistance, making it essential for testing battery internal resistance in 18650 cells and lead-acid batteries.
What display count do I need for standard industrial troubleshooting?: A 6000-count digital multimeter provides the necessary resolution for most industrial diagnostics. True RMS capability is also critical, as it ensures accurate AC voltage and current readings on non-sinusoidal loads like variable speed drives.
How do I safely discharge high-voltage capacitors before servicing a circuit?: Never short a high-voltage capacitor with a standard screwdriver, as this causes dangerous arc flashes and component damage. Use a specialized capacitor discharge pen rated up to 1000V to safely dissipate stored energy through internal capacitive resistance.
Why should I select silicone-insulated test leads over PVC alternatives?: Silicone insulation remains highly flexible in cold environments and will not melt if it accidentally contacts a hot soldering iron. This durability makes silicone-banana probe cables the preferred choice for demanding industrial test benches and field service kits.