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Test & Measuring Instruments

Multimeters, oscilloscopes and bench supplies to measure, test and debug with confidence.

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Test & Measuring Instruments

Test and measuring instruments for electronics labs, electricians, students and makers: digital multimeters, clamp and LCR meters, oscilloscopes, bench power supplies, insulation testers, panel meters, tachometers, thermometers and calipers from Mastech, MetroQ, OWON, INGCO, Metravi and more.

Buying guide

Pick the right meter for the job, first time.

From a first multimeter for a school project to an insulation tester for site work: what each instrument measures, which specs matter, and how to test safely.

  • 12 instrument types
  • Specs explained
  • CAT safety
01

What do you want to measure?

Start here. Each card opens the matching range in our store.

Voltage, current, resistance

The first tool every maker needs. Digital for accuracy, analog for watching a value swing.

Multimeters →

Current without cutting wires

Close the jaws around one wire to read its current. Ideal for house wiring, motors and AC loads.

Clamp meters →

Components: L, C, R, transistors

Identify and check capacitors, inductors, diodes and transistors in seconds.

LCR & testers →

Signals over time

See PWM, serial data, noise and ripple as a wave. Signal generators make test signals.

Oscilloscopes →

Is it live? Is it safe?

Voltage detector pens warn of live wires. Insulation testers check cables and motors before power-up.

Insulation & voltage →

Watch power all the time

Fit into a project box or board and show volts, amps, watts and energy live.

Panel meters →

Heat, humidity, light, sound

Thermometers, IR guns, hygrometers, lux and sound meters for labs, workshops and 3D printing.

Environment meters →

Motor speed (RPM)

Measure how fast a shaft, fan or propeller spins. Laser models need no contact.

Tachometers →

Size, weight, level

Vernier and digital calipers, measuring tapes, pocket scales and spirit levels.

Calipers & tools →

Leads and probes

Replacement test leads, crocodile clips and scope probes. Match your meter's CAT rating.

Leads & probes →

Clean power for testing

Set an exact voltage and a current limit, so a wiring mistake does not burn your board.

Bench power supplies →

Battery health

Check cells, LiPo packs and lead-acid batteries before a flight or a ride.

Battery testers →
02

The specs that matter

Product pages are full of numbers. These are the ones that change what you can do.

Multimeters

Counts (2000, 6000, 20000)
How fine the display is. A 6000-count meter shows 5.999 V where a 2000-count one shows 5.99 V.
Auto-range
The meter picks the range for you. Easier for beginners; manual range is cheaper and fine once you know your values.
True RMS
Reads AC correctly even when the waveform is not a clean sine, such as from inverters, dimmers and motor drives.
Extras
Capacitance, frequency, temperature, continuity buzzer and non-contact voltage (NCV) save buying a second tool.

Clamp meters

AC only or AC/DC
Basic clamps read AC current only. For DC (solar, batteries, EV and drone packs) choose an AC/DC model.
Jaw opening
Must be wider than the cable you will clamp. Check the mm figure against your thickest wire.
Current range
400 A suits homes and shops; 1000 A suits industrial panels. Small-current work wants a fine low range.
One wire only
Clamp a single conductor. Around a whole cable the currents cancel and you read zero.

Oscilloscopes

Bandwidth (MHz)
Choose about five times the fastest signal you will look at. Arduino PWM and audio are fine on a small scope.
Sample rate (MSa/s)
Points captured per second. Higher sample rates draw fast edges more accurately.
Channels
One shows a signal; two let you compare input with output, or clock with data.
Handheld or bench
Handheld and pocket scopes go to the field. Bench scopes give a bigger screen and more channels.
03

Who needs what

A starting point for common buyers. Every kit grows over time.

You areStart withAdd later
Student or school labDigital multimeter with continuity buzzerComponent tester, bench power supply
Arduino / ESP32 makerAuto-range multimeter, panel meter for projectsPocket oscilloscope, LCR meter
Drone and RC hobbyistMultimeter, battery testerAC/DC clamp meter, laser tachometer
ElectricianCAT III clamp meter, voltage detector penInsulation tester, True RMS multimeter
Repair technicianTrue RMS multimeter, LCR meterTwo-channel oscilloscope, bench power supply
Workshop and 3D printingDigital caliper, IR thermometerPocket scale, hygrometer for filament storage
04

Stay safe: read the CAT rating

The CAT rating printed near the sockets says where a meter is safe to use. A higher category handles bigger voltage spikes.

CAT I

Low-voltage electronics, battery projects, circuits not connected to the mains.

CAT II

Plug-in appliances and sockets inside the home.

CAT III

Distribution boards, fixed wiring, motors and industrial machines.

CAT IV

The supply side: energy meters, outdoor lines and the incoming service.

  • Leads: test leads must carry the same or a higher CAT rating than the meter.
  • Sockets: never measure voltage with a lead in the current (A) socket. Move the dial before you move the probes.
  • Prove it: check the meter on a known live source before and after testing a circuit you believe is dead.
  • Fuses: replace a blown fuse only with the exact type the manual names.
05

Questions buyers ask

Digital or analog multimeter: which should I buy?

Buy digital for your first meter. It is more accurate, easier to read and usually adds auto-range and a continuity buzzer. An analog meter is handy as a second tool to watch values that move, such as a charging capacitor.

What does True RMS mean, and do I need it?

A True RMS meter reads AC voltage and current correctly even when the waveform is distorted. You need it for inverters, UPS output, LED drivers, speed controllers and solar systems. For simple mains checks a standard meter is enough.

Can a multimeter test capacitors and transistors?

Many multimeters measure capacitance, and most test diodes. For inductors, ESR or identifying transistor pins, an LCR meter or component tester is faster and more accurate.

Contact or non-contact (laser) tachometer?

A laser tachometer reads RPM from a reflective strip without touching the part, which is safest for propellers and fans. A contact tachometer touches the shaft end and can also measure surface speed with its wheel.

Vernier caliper or digital caliper?

A digital caliper is quicker to read and switches between mm and inches. A vernier caliper needs no battery and lasts for decades. Both measure outside, inside and depth.

How much oscilloscope bandwidth do I need?

About five times the frequency of the signal you want to see clearly. For Arduino PWM, audio and most hobby work a 10 to 50 MHz scope is enough; faster digital buses need more.

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Not sure which meter fits your project? Message us on WhatsApp with what you want to measure and we will help you choose.

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About Test & Measuring Instruments

Test and measuring instruments for electronics labs, electricians, students and makers: digital multimeters, clamp and LCR meters, oscilloscopes, bench power supplies, insulation testers, panel meters, tachometers, thermometers and calipers from Mastech, MetroQ, OWON, INGCO, Metravi and more.

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