Will this work with 24v ac fairy light, i bought few which doesn't work and too sensitive for low voltage.

I wouldn’t bother buying mate. The Martiandale stopped working after the 3rd time of using the rcd test button. And the light pen stopped working after about 2 months

Does the tester make a noise when it detects that the socket is live ?

Yes. The small test bleeps and the red light flashes when it detects a current. The plug socket tester does not make a noise, as you might expect as your testing a live plug socket

Manufacturer	Proster
Part number	‎TOPPW050
Item Weight	210 g
Package Dimensions	25.6 x 16 x 7.7 cm; 210 g
Item model number	PST254uk
Colour	Orange+Black
Style	Compact
Power source type	Battery Powered,Electric
Item Package Quantity	1
Specification met	[PARTIAL]
Batteries included?	No
Batteries Required?	No

Voltage Tester, Upgraded Socket Tester Non-Contact Voltage Tester Pen and Plug Tester Socket Tester kit with LED Flashlight Pre-Installed Battery with Sound and Light Alarm

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Description

Specifications

Common Questions