The Fluke ST240+ RCD Socket Tester with Beeper checks that each wire in the outlet is properly connected to the building's electrical system. Via the bright LEDs and included chart, you can quickly and easily verify the wiring of an outlet. Able to identify several common wiring errors, including reversed live and neutral wires and an earth fault, the ST240+ will give you confidence on your next job!

The ST240+ also gives you a unique audible alert anytime voltage is detected. Save time when trying to identify which circuit breaker is connected to which outlet. Just plug the socket tester in, walk to the circuit breaker panel, and listen for the beeper to turn off or on as you flip the breakers. Once it does, you’ve found the correct breaker. When switched on, the integrated beeper can also alert you to hazardous voltage at the outlet, even if the wiring is incorrect. Plus if you are working in an environment where you don't want to disturb others, the beeper can be switched off.

The included RCD test button on the socket tester allows you to test the operation of RCD outlets. With a single push, the ST240+ can verify the operation of your RCD equipped outlet. If the RCD trips as expected, you can move on. If not, it's time to take a closer look.


  • SIMPLE OPERATION - Plug into socket; with the bright, easy-to see LEDs, verify correct wiring or identify common wiring problems in both standard and RCD outlets
  • SAVE TIME - Eliminate multiple trips back and forth by using the beeper on the RCD to help identify if a circuit breaker is switched on or off
  • RCD OUTLETS - With an integrated RCD test, you can feel secure knowing that your RCD equipped outlets are functioning properly
  • KNOW MORE, FASTER - With the handy chart, quickly identify one of six wiring conditions for the outlet
  • HEAR THE RESULTS - The audible beeper lets you know anytime voltage is detected

Fast visual identification of 6 wiring conditions
The ST240+ has three bright, easy-to-see LED indicators. This lets you see, at a glance, one of six wiring scenarios:

  • Correct installation
  • Earth fault
  • Neutral fault
  • Live fault
  • Live & neutral reversed
  • Live & earth reversed


  • Rated Operating Voltage: 230V ac +/-10% at 4mA
  • Wattage: 0.92W Typical
  • Frequency: 50Hz
  • Integrated, Switchable Beeper: Yes
  • RCD Test: Yes
  • Indicator Light: 1 Red, 2 Green LEDs
  • Rating: 300V CAT II


  • 2 Year Warranty Covered By Fluke

All products must be installed by a licensed electrican. DIY electrical work is illegal and very dangerous.

Change of Mind
All products purchased from MJS Electrical Products & Supplies are backed by a thirty (30) day Peace of Mind Return Policy. All products returned must be in perfect unused condition, with all components, complete with original packaging. We will not allow returns on damaged or incomplete products. Proof of purchase is required. Should the product not be in original condition, please contact us before returning it as this may save you some unnecessary costs.

Damaged / Faulty Goods
If you find that the goods were damaged in transit or were faulty in some manner, please contact us within 24 hours of receiving the goods. We will organise for the return of the goods and arrange a credit towards your next purchase or send a replacement product. Customer will incur the cost of return postage and be credited the purchase price only. We recommend that you return your unwanted items using registered post or trackable courier. We can not be held responsible if returned items are lost in transit.

Product warranties are governed by the respective manufacturers and / or suppliers warranty terms and conditions (available on request). We will not be liable to you or any third party for any loss suffered due to product failure. We will process product warranty claims through the respective manufacturers and/or suppliers. All warranties are void if the product is not installed by a licensed electrician.

Model # ST240+
Barcode # 195112033616
Brand Fluke
Shipping Weight 0.2500kg
Shipping Width 0.075m
Shipping Height 0.075m
Shipping Length 0.150m