Martindale EZ365 Socket, Earth Loop & RCD Tester
£45.00 / £54.00 incl VAT
⚡ Quick & easy testing of polarity, loop impedance and RCDs (30mA)
⚡ Red/Green LEDs and buzzer indicate 28 fault conditions
⚡ Non-trip earth loop impedance test
⚡ Incoming supply polarity swap touch test (L-NE reversal)
⚡ RCD trip test
In stock
Description
It is fair to say that when it comes to a first line of defence in electrical safety, socket testers are a great way of keeping anyone working with electricity safe. Consequently, there are a huge variety of socket testers on the market and it can be difficult to choose which one is best suited to the application you are working on. All socket testers will check basic connections have been made correctly, however three new Martindale Electric socket testers give professionals more features and less headaches when it comes to choosing the right unit for the job in hand.
Martindale Electric’s BZ701, for example, not only detects the basic 28 socket wiring fault conditions and checks the mains voltage level, it also safely detects Line-Neutral reversal (cross polarity) at the incoming supply. The polarity swap test detects fault conditions on PME/ TN-C-S systems (the most common type of supply) that cannot be identified by normal socket testers. It is easily activated by using the touch pad on the BZ701. Correct polarity is indicated by three flashing green LEDs. A fault condition is clearly indicated by three red LEDs and a warning buzzer.
The recently launched EZ165 and EZ365 also detect the 28 basic fault conditions and check the mains voltage level too. Both models also show how safe the earth wiring is by carrying out a non-trip earth loop test and indicating its value in six discrete ranges. A low earth resistance is essential for safety disconnection devices to work properly and prevent electrocution when faults occur.
In addition to all the features of the basic EZ165 model, the EZ365 not only checks for L-NE polarity swap at the incoming supply as featured on the BZ701, but also can be used to trip test 30mA RCDs by using the touchpad.
Martindale Electric’s socket testers make it easy for electricians to choose the right level of features they need for their work and offer a crucial first line of defence when it comes to electrical safety.
These three sophisticated testers are in addition to the Martindale famous Check Plug and “Buzz-it” ranges.
Key Features
- In addition to detecting 28 socket wiring fault conditions and checking mains voltage levels, the EZ365 verifies the earth wiring by carrying out a non-trip earth loop test and indicating its value in 6 discrete ranges from less than 1.7Ω to 500Ω.
- A low earth resistance is essential for safety disconnection devices to work properly and prevent electrocution when faults occur. In contrast basic socket testers only indicate the presence of an earth and will do so even when resistance values are dangerously high.
- Socket polarity and earth wiring faults are identified by a combination of red LEDs. The 3 LEDs correspond to neutral, earth and live connections to aid fast identification of the source of common faults. A look up chart on the tester provides further fault diagnosis.
- The EZ365 also has the capability to check for L-NE polarity swap at the incoming supply and can be used to trip test 30mA RCDs. The polarity swap test detects a serious fault condition that cannot be identified by normal socket testers and is easily activated by using the touch pad on the EZ365.
- The EZ365 is an Advanced Socket Tester as defined by the Health & Safety Executive as it indicates earth loop impedance. Advanced Socket Testers offer a simple solution to verifying socket earthing and are commonly used by engineers and technicians prior to servicing and installing mains powered electrical and gas appliances.
Specifications:
| Nominal operating voltage | 230V AC rms |
| Operating frequency | 50Hz |
| Power consumption | <2.5W |
| Power | from mains socket under test |
| Non-trip earth loop impedance ranges | 0 – 1.7 – 5 – 10 – 100 – 200 – 500Ω |
| Earth loop threshold accuracy | ± (10% + 0.3Ω) * |
| Voltage low indication | <195V ± 5% |
| Voltage high indication | >270V ± 5% |
| Earth neutral voltage high indication | >30V nominal |
| Open earth indication | >500Ω ± 10% |
| RCD test current at 195V | 30mA |
| Duration of RCD test current | 300ms |
| Polarity reversal test | L-NE swap at incoming supply |
| Dimensions | 65 x 80 x 59mm |
| Weight | 93 g approx |
| Temperature (Operating & Storage) | -10°C to 40°C, at max. 60% RH |
| Altitude | up to 2000m |
| Pollution degree: | 2 |
| Safety | Conforms to BS EN 61010-1, CAT II 300V, Class II, double insulation |
| EMC | Conforms to BS EN 61326-1 |
* Measurement accuracy can be affected by highly inductive or capacitive loads distributed on the supply.
🚚 Testersmans Shipping Policy
Free Mainland GB Delivery Over £150
We offer free delivery on most mainland Great Britain orders over £150 (ex VAT).
This applies across England, Wales, and most of Scotland, excluding certain remote or offshore postcodes.
If your order total falls just short of £150, or you’re a returning customer, feel free to contact us — we may be able to offer a discount code or delivery workaround.
📞 01945 738112 | ✉️ sales@testermans.co.uk
📦 UK Delivery Options
We work with both Royal Mail and DHL to offer reliable and flexible delivery across the UK:
- Royal Mail – Best suited for lighter parcels and for customers in remote regions, including the Highlands, Islands, and Northern Ireland.
- DHL – Ideal for most mainland UK orders, providing fast, tracked delivery and excellent reliability for time-sensitive shipments.
Our checkout system automatically displays the available delivery services for your postcode and order weight, ensuring you always see the most suitable options.
Note: Heavy, bulky, or freight-only orders will be charged separately.
Our website is designed for quick, transactional purchases rather than bulk or palletised orders.
Please contact us in advance for a tailored freight quotation if your order falls into this category.
⏱ Dispatch & Delivery Timing
We aim to dispatch all in-stock orders promptly, but delivery depends on both when you order and which service you select.
- UK orders: placed by 2:00 PM Monday–Friday are usually dispatched the same day.
- International orders: placed by 2:00 PM Monday–Thursday are usually dispatched the same day.
Orders placed after these times are processed the next working day. This means delivery may occur the following day or later, depending on the courier and service selected.
Once dispatched, your chosen delivery service determines how quickly your parcel arrives:
- Standard services We use Royal Mail Tracked 24 or DHL Parcel as our ‘Standard’ services. They are not guaranteed to arrive next working day.
- Premium services (e.g. Royal Mail Special Delivery or DHL by Noon) offer guaranteed delivery windows.
If your order is time-sensitive, we strongly recommend choosing a guaranteed service or contacting us before ordering to confirm availability.
Please note: For logistical reasons, we may occasionally adjust the delivery method selected at checkout. For example, smaller items may be better suited to letterbox-friendly packaging or may be at greater risk of delay or loss via certain services. We actively monitor courier and postal service disruptions—including strikes and delays—and may modify shipping arrangements to help ensure timely and secure delivery.
📅 Busy Periods & Delays
We always aim to dispatch promptly, but delivery times may be affected by:
- Seasonal demand (e.g. Christmas, bank holidays, or industry shutdowns)
- Courier network delays outside our control
- Supplier lead times or calibration requirements for certain equipment
If your delivery is time-critical, please contact us before ordering so we can confirm stock and courier availability.
🌍 International Shipping
We ship worldwide using UPS Express Saver® and other trusted global courier partners. All international shipments are tracked and generally dispatched Monday to Thursday to ensure smooth customs clearance and transit.
Estimated delivery times:
- Europe: 1–2 working days
- North America: 2–3 working days
- Asia-Pacific & Rest of World: 3–5 working days
Delivery times vary depending on location, customs clearance, and local courier performance.
💰 Taxes, Customs & Import Duties
International customers are responsible for any applicable taxes, customs charges, or import duties.
These are not included in our product or shipping prices.
Your courier will typically provide a secure payment link for any import charges once your parcel reaches customs.
If import fees are refused and the parcel is returned, we will issue a refund minus all incurred shipping and return costs.
📍 Using Your Own Courier
If you would prefer to arrange collection via your own courier (UK or international), please contact us before placing your order to coordinate collection from our Wisbech warehouse.
📝 Important Notes
- Please ensure your delivery address and contact number are correct at checkout.
- Undelivered parcels may be returned to us after a short holding period.
- Redelivery or return fees may apply, even if your order originally qualified for free delivery.
- By placing an order, you confirm your understanding and acceptance of this policy.
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