Extech 40180 Tone Generator and Probe Kit

Fits cable and telecom tracing jobs that need a handheld tone generator plus inductive amplifier probe — RJ11/RJ45 and alligator clips, with tip/ring and clear/busy/ringing line status on telephone pairs.

Key advantages

Tracing kit — Tone generator + insulated inductive amplifier probe for wire/cable identification
Tests — Wire trace, continuity, clear/busy/ringing line, tip/ring identification
Tone — 1 kHz (±15%) square wave, about 4.3 Vrms (10.2 V p-p); continuous or wobble
Connections — Alligator clips; modular RJ11 and RJ45; probe headphone jack
Kit contents — Amplifier probe, tone generator, alligator clips, RJ11/RJ45 cables, 9 V batteries, case

Typical applications

Wire and cable identification in walls, panels, and bundles with the inductive probe
Telephone pair tip/ring polarity and clear/busy/ringing status checks
Continuity checks (tone extinguish around 10 kΩ) on short cable runs
Field kits needing RJ11/RJ45 plus alligator-clip access in one case

Selection guide

Tone — Frequency 1 kHz (±15%); level about 4.3 Vrms square wave (~10.2 V p-p) per OEM UM
Environment — Operating 0 to 40 °C, ≤80% RH; storage −10 to 50 °C, ≤80% RH
Power — 2 × 9 V batteries (tone generator and probe, one each)
Form / approvals — Handheld kit with case; CE on datasheet
Live-circuit caution — Do not connect TONE mode to active circuits over 24 VAC; CONT mode is not for live circuits

Common mistakes

Expecting LAN certification (NEXT/return loss) — 40180 is tone/continuity/line-status, not a cable certifier
Leaving battery count blank — tone generator and probe each take one 9 V battery
Using the probe without sensitivity control on dense bundles — probe has sensitivity adjustment and speaker
Ordering when you need breaker-find — use a CB10-class kit for receptacle breaker locate instead

When to RFQ / what to tell us

Confirm tone/probe tracing need (not LAN certifier or breaker finder)
RJ11/RJ45 vs alligator-clip primary use, headphone need, quantity
Ship-to and whether spare 9 V batteries or case must be included

Request a Quote · Get selection help

Specs

Spec	Value
SKU	24305
Brand	Extech
Model	40180
Product type	Tone generator and amplifier probe kit
Kit	Tone generator and insulated inductive amplifier probe kit
Tests	Wire trace, continuity, clear/busy/ringing line, tip/ring identification
Tone output	1 kHz (±15%), square wave 4.3 Vrms (10.2 V p-p approximate); continuous or wobble
Continuity	LED extinguishes at approximately 10,000 Ω (CONT mode)
Connections	Alligator clips; modular RJ11 phone and RJ45 connectors; probe headphone jack
Probe	Insulated inductive probe; built-in speaker with sensitivity control
Power	9 V battery ×2 (tone generator and probe, one each)
Over-voltage	Tone generator over-voltage protection for voltages less than 100 VDC (UM)
Operating	0 to 40 °C, 80% RH max
Storage	−10 to 50 °C, 80% RH max
Dimensions	Probe 228 × 57 × 25 mm (9 × 2.3 × 1 in); Generator 64 × 64 × 38 mm (2.5 × 2.5 × 1.5 in)
Weight	0.6 lb (272 g)
Approvals	CE; warranty per current Extech/FLIR terms
Included	Amplifier probe, tone generator, alligator clips, RJ11/RJ45 cables, 9 V batteries, case

Documents

FAQ

Q: Is 40180 a cable certifier? A: No — it is a tone generator and amplifier probe kit for wire tracing, continuity, and telephone line status.

Q: What connectors are included? A: Alligator clips, modular RJ11 and RJ45, plus probe headphone jack per OEM specs.

Q: What should I send for a quote? A: Tracing vs certifier need, connector preference, quantity, ship-to.