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RCD vs PRCD: Why are they needed?

A portable RCD is an essential part of any testers kit for any test & tag job. But what are they and why are they so vital for testing and tagging electrical devices. More importantly, how do portable RCD differ from a regular RCD?

What is a RCD?

A Residual Current Device is used to prevent electrical shocks or electrical fires. By measuring the current in a system it can detect whether the electricity is flowing through an unintended path and automatically shut off the circuit. For example if electricity enters a person the residual Current Device will cut the power before it can give you too nasty a shock. Potentially saving a life or preventing an electrical fire.

Typically you can find RCDs throughout your home in places such as in the fuse box. They may also be built into socket outlets and some extension cords.


What is a PRCD?

A portable RCD is an especially useful piece of kit for any electrician or tester. By having a PRCD the user can guarantee their safety when working with an appliance that is of safety concern. It can plug into any standard socket and automatically cut the power when it detects any issues.

In fact, portable RCDs are so important they are often built into portable appliance testers

Whether you are a professional or planning on doing any DIY involving appliances, an RCD is a must have. Metrotest has a selection of reliable RCDs to choose from. Visit our store or get in contact with us to find the right portable RCD for you.

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Introducing the MET20: Facial Recognition Scanner & Covid-19 Temperature Scanner

Metrotest are pleased to announce the availability of a facial recognition scanner, complete with a covid temperature scanner.

The MET20 Facial scanner is an all-in-one Facial recognition and Temperature scanner with the ability to provide access control and staff attendance details. In the case of the workplace, the MET20 can allow access to authorised individuals and/or prevent those with a dangerous fever from entering. Thereby protecting others from the spread of diseases such as covid-19.

Facial Recognition Scanner Security benefits

This amazing little unit uses thermal imaging along with artificial intelligence assisted facial recognition software to accurately record body temperature as well as control door entry.

This is an ideal device that can be used in a wide range of environments and applications. Such as in areas where the management of people’s movement is important for security reasons. The exit and entrances of the following may benefit from a system that does not require easily lost or stolen keycards:

  • Schools and Universities 
  • Factories and industrial manufacturing
  • Healthcare environments such as hospitals and research laboratories
  • Offices
  • Research and development

Increased security can help protect the sensitive information, expensive equipment, or the spread of viruses to the sometimes large workforces.

Covid-19 Temperature Scanner for public safety

If security is not of importance, the MET20 can function solely as a covid-19 temperature scanner. Perfect for the entrances of shops and other areas frequented by visitors. Stopping the spread of the virus.

The MET20 Facial recognition and covid-19 temperature scanner is only active when a scan has been completed and uploaded. Meaning, it does not passively scan those simply walking past. So, no need to worry about big brother!

Available from $1490+GST per unit these are an amazing addition to any work site and help to keep everyone safe, while providing excellent security. Contact us online or visit our store for more details.

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Here are 3 Reasons to Hire Quality Testing and Tagging Specialists

Testing and tagging is the process of checking the safety of portable appliances. Testing and tagging involves a visual inspection followed by electrical testing with a Portable Appliance Tester. The tagging refers to the labels attached to tested appliances to indicated their safety. 

Although testing and tagging is somewhat straightforward, the implications of an improperly performed test could result in serious injury. So, hiring a quality testing and tagging specialist, with attention to detail is vital to reduce risk. To test and tag, one needs to be deemed competent under the current standards and does not necessarily need to be an electrician. Appliances need to be test regularly to reduce risk, and poor testers may miss or ignore the signs of danger.


A competent test and tag specialist ensures the standard and best practices are followed. The standards only outline how to safely and correctly test an appliance. Whereas, the best practice goes above and beyond these outlines to ensure a comprehensive service. A competent tester tests patiently and tags accurately. The tester will then keep a detailed record of every test with numerical data.

A less quality testing and tagging specialist may rush through their tests, and in the process follow the standards incorrectly, putting themselves and you at risk.

Quality Testing and Tagging Guarantee

As stated, a quality tester will keep detailed records of their tests. Under the standard record keeping is not required. However, even the most basic record keeping is strongly recommended. The ability to look at the exact results of a test gives you a guarantee that the test has been performed correctly, and its results are certain.

Simple pass/fail records can easily be made up, and if the tester was to be audited, little could be done to hold them accountable for dodgy testing and tagging.


We have heard many horror stories of testing and tagging specialists who rush through their tests and have little regard for the environments they are testing. At Metrotest we take pride in our brand image, and the quality service we provide.

Part of that means keeping a professional attitude and complying with the health and safety protocol of the workshops we frequently test. After all, testing and tagging is about preventing injury, not potentially causing one.

Here is what one of our recent clients had to say:

“I would like to express my thanks to you and your team for their professionalism, punctuality, attention to detail and the general way they conducted their work on site. The guys were always polite and worked around my office and workshop teams, to ensure they did not interrupt business, whilst adhering to our site health and safety rules.

A team to be proud of!” – Haydn Murray, ETEL South Island Business Manager

Hopefully, you learned what to look for in a quality testing and tagging specialist. If you need your appliances tested, give Metrotest a call at 0800 638 768 or contact us online for more information.

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If You Don’t Test and Tag, You Take a Risk


Not everyone sees the importance to test and tag their appliances or other electric-powered equipment. This is most especially true when a piece of electrical equipment is relatively new. Unfortunately, this poses risks to everyone who gets access to an electric-powered tool or appliance. However, we believe that it’s crucial to perform regular appliance testing and tagging, no matter how old or new an item is.

After all, no one wants to experience electric shock or other potential mishaps with a faulty appliance. To give you a more precise grasp on the importance of testing and tagging, here are the usual risks that come with a defective piece of electrical equipment.


#1. Increased risk for electrical shock

If you work in a cramped space and your appliance or equipment develops an electrical fault, it becomes difficult to avoid or prevent electrical shock. Unfortunately, an electrical shock can cause the following effects on the body:

  • Muscle spasms
  • Cardiac arrest
  • Nervous system malfunction
  • Burns
  • Increased risk for developing eye cataract

#2. Faulty appliances can cause damages

Without conducting regular testing and tagging, some of your electrical equipment becomes increasingly vulnerable to damage. It can also cause damages to your property. Below are some examples of potential problems that you might have to deal with if you have faulty equipment:


  • Fire damage – Fire damages are perhaps the most dangerous outcome of having a defective piece of electrical equipment. The electrical short spark can cause the appliance to go up in flames. It can also affect flammable materials inside the property like wallpaper, insulation, cabinetry, and curtains.
  • Physical damage – When an appliance starts acting up, it can cause physical damage to itself, the outlets, switches, and other components of your electrical system.
  • Damage to the surge protector – Each electrical equipment comes with microprocessors that detect power surges (electrical supply fluctuations, lightning storms, etc.). Unfortunately, if you don’t get your appliance tested and tagged, you may not be aware of potential problems resulting in damage to your surge protectors. This could potentially decrease its lifespan because it has less protection from power surges.

#3. Increased difficulty in managing risks in workplaces and homes

When you’re not sure about the integrity or safety of an appliance or a piece of electrical equipment, you become increasingly wary of the risks involved. This makes it hard to work around the devices. It also adds to your responsibilities and duties.


Find your test and tag supplies at MetroTest

We can’t emphasize enough the value of getting your devices tested and tagged. It’s a simple process that gives you peace of mind knowing that your electrical equipment works without a glitch. As long as you have the competencies to test and tag, you can handle the task on your own. Alternatively, you can call in a third party to carry out the job for you.

Need testing and tagging equipment and supplies? Whether you need to shop for your home, school, office or business, we have plenty of options you can choose from for your appliances and other electrical equipment. Check out our product catalogue here at MetroTest today!

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Fieldays Special – EasiPAT 10 + AS/NZS 3760

Do not miss the Metrotest fieldays special. Pick up a Sonel Metro EasiPAT 10 + bonus online AS/NZS 3760 competency training for $1490 + GST. This amazing fully functioned portable appliance tester is the next step in doing it yourself. The Sonel Metro EasiPAT 10’s features include PRCD testing, battery & mains operated, polarity testing and more. If you are looking to get into doing your own onsite testing, set yourself up with the Sonel Metro EasiPAT 10, the most reliable and easy to use portable appliance tester on the market. Ensure you are ready to test safely and with confidence with the included AS/NZS 3760 online competency training course. With the fieldays special choose from a range of different colour Metrotest Tiny Tags rolls to meet your requirements. Testing and tagging is an essential practice in workplace safety, and the most effective way to check your electrical equipment functions properly. For additional information give us a call at 0800 638 768 or email

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Voltage Testers, Which One Do I Need?

Whether you’re a professional, hobbyist, or weekend warrior, having the proper voltage testers can make a big difference to your safety and the efficiency of your work. Essentially, a voltage tester helps you determine whether current flows into a piece of equipment. If current flows through a piece of equipment or an electrical outlet, the light or indicator of the tester will glow. Conversely, if the indicator doesn’t light up, it means that the equipment or outlet might be broken or flawed.

Let’s learn more about the specific types of voltage testers and which ones you should have in your toolbox.

Types of Voltage Tester

When testing for voltage, you can make use of specific types of voltage testers. For example, if your goal is to check for current, you will most likely need a simple neon tester. It’s the simplest type of voltage tester ideal for small projects. Besides the neon circuit testers, here are other types of voltage testers and other ways you can use them;

Analog Volt-Ohm Meter

It measures voltage or voltage changes. You can get the readings by looking at the needle pointer of the device. Permanent Volt-Ohm meters usually come as separate equipment. However, there are some cases when you can have them integrated in a multimeter device or similar.

Digital Multimeter

Primarily, digital multimeters measure voltage, resistance, and current. It’s a standard tool used in running diagnostic tests on all types of electrical equipment. Compared to its predecessor, digital multimeters provide more accurate readings. A typical modern-day digital multimeter also comes with additional features that can help you get more information about your electrical device.

Continuity Tester

The continuity tester is similar to a multimeter. However, it’s less complicated as it primarily focuses on checking whether a circuit is open or closed. Testing for a circuit’s continuity is crucial in identifying damage in a device’s critical electrical components. Continuity tests may also allow you to determine the quality of the soldering and measure resistance.

Voltage Detector

Similar to neon voltage testers, voltage detectors help you determine if current runs through an electrical device. However, instead of simply producing light signals, a voltage detector also makes sound signals to indicate a flowing current.

Non-contact Voltage Tester

Otherwise known as inductance testers, this type of voltage testing equipment is arguably the safest and easiest option to use. As its name suggests, it doesn’t require you to touch an electronic device or wire with this tester. Instead, the wand automatically senses voltage. It’s a standard option among homeowners and hobbyists.

Solenoid Voltage Tester

Solenoid volt meters detect polarity and voltage. Most electricians use this tester because it works for both AC and DC voltage that reaches a maximum of 600 volts. You can easily find one at electrical supply companies as well as retail shops.

Digital Clamp Meter

Professional electricians also have a digital clamp meter in their toolbox. Essentially, this device works as a multimeter but offers more functionalities. The jaws of the clamp meter open and close around a conductor allowing for a reading to be displayed on the meter.

Insulation Tester

An insulation tester utilises a high voltage DC charge to test and measure resistance in wires and electronic components. Primarily, it detects current leakage or broken insulation. If you have such problems, then your device or electrical system might be at risk of fire, blown fuses, tripped circuit breakers and arc faults.

Loop Tester

Loop testers can help you assess if a fuse or circuit breaker can protect your electrical system should a fault or disruption occur. It also allows you to determine if your existing circuit can disconnect fast enough to reduce risks for overheating or fire.

Find the Right Electrical Testing Tool at Metrotest

Here at Metrotest, we offer a variety of electrical testing tools. Besides voltage testers, we offer all kinds of tools that can help you maintain the safety of your appliance, electronic device, or electrical system.

Here’s a quick list of the products you can find at our shop:

Electrical Testing ToolsPrice Range
Insulation Testers$715 to 3,600 incl GST
Loop Testers$1080 to 3,900 incl GST
Clamps and Digital Multimeters$174.80 to 375 incl GST
High Voltage Insulation TestersGet a quote today!
Power Quality Analysers$2,733.70 to 14,960 incl GST
Multifunction Installation Tester$1,430 to 3,600 incl GST
Cable Location Equipment$2,047 to 18,850 incl GST
RCD Testers$333.50 to 1,430 incl GST


Learn more about our product offers at Metrotest today! You can send us a quick message or call us at 0800 638 768.