Electrical installation tester Topex 125–250 V, 140 mm probe (39D058)

The Topex Electrical installation tester 125–250 V with a 140 mm probe is a handheld voltage detector designed for basic verification of AC presence in household and light-commercial wiring. This compact instrument detects the presence or absence of voltage in the range of 125–250 V and provides a simple means to check outlets, switches, light fixtures and wiring runs. The long 140 mm probe allows access to recessed terminals and contact points while keeping the operator at a safe distance from conductors.

Advantages

This Topex tester offers straightforward operation and a compact form factor suitable for quick checks on installation sites. The 140 mm probe provides extended reach for recessed or difficult-to-access contacts. Its detection range covering 125–250 V AC makes it appropriate for standard residential and light-commercial circuits. The handheld design is portable and easy to carry in a pocket or tool bag for electricians and DIY users.

Suitable for

• Checking presence or absence of mains voltage in sockets and switches
• Quick verification of live conductors in lighting fixtures and junction boxes
• Basic safety checks before maintenance or component replacement
• Portable field checks during installation and troubleshooting

Key specifications

• Voltage detection range: 125–250 V AC
• Probe length: 140 mm
• Handheld, non-contact/contact-capable probe design for point testing
• Suitable for standard household and light-commercial AC circuits

How to use

Before use, visually inspect the tester and probe for damage. To measure, place the probe tip in contact with the conductor or terminal to be tested while observing the indicator (visual or acoustic, depending on the unit). Ensure the tester body or reference contact is held as instructed by the manufacturer to complete the circuit if required. Use the tool to determine presence or absence of voltage in the specified 125–250 V range, and avoid using it on unknown high-voltage systems or where insulation is compromised.

Usage recommendations

Use the tester only on circuits within its specified voltage range and follow standard electrical safety practices: disconnect power where possible, wear appropriate protective equipment, and verify the tester operation on a known live source before and after testing. Store the device in a dry, dust-free environment and replace the tester if probe insulation or housing shows signs of damage.