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Yellow plastic tone generator and probe kit, rectangular transmitter with clip leads and wand receiver, 9.1 by 2.2 by 1.1 inches

aFe Power 77HP2 Tone Generator and Probe Kit

SKU CH-ZYBM-4DQWS

Traces cables, identifies faults and tests line status with selectable tones and a built-in speaker

  • Team affiliation1 Piece
  • Key featuresToner electrical tool, Battery Powered, false
  • Overall height3.5 L x 2.7 W x 1.5 H inches
  • Overall width3.5 L x 2.7 W x 1.5 H inches
  • Overall length3.5 L x 2.7 W x 1.5 H inches
  • Product typeClamp
  • Identifies cables in one second with selectable continuous or variable tone generator
  • Traces circuits through walls using 200EP inductive amplifier with nominal 30dB gain
  • Tests line tracking, short circuits and clear/busy/ringing status on telecom and network lines
  • Clamp mode enables direct measurement on non-terminal cables without damaging insulation
  • Operates from 0 to 50 °C with two 9V batteries (not included)

aFe Power 77HP2 Tone and Probe Kit

The aFe Power 77HP2 is a tone generator and probe kit designed for telecommunications technicians and network engineers who trace and identify cables. It handles line tracking, short-circuit testing, and clear/busy/ringing status recognition on telephone and data wiring. The kit includes both generator and inductive amplifier probes for complete circuit verification.

Clamp-style probe with 30 dB gain

The probe uses a clamp measurement mode that allows non-contact tracing on non-terminated cables without damaging insulation. Its professional plastic carbon-fibre test head prevents accidental shorts while the nominal 30 dB gain and 100 MΩ input impedance provide sensitive signal detection. Adjustable volume and a built-in speaker give immediate audible feedback during tracing tasks.

Operates on two 9 V batteries

The unit requires two 9 V batteries (NEDA 1604, JIS 006P, or IEC 6LR61) which are not supplied, so users must source them separately. Selectable continuous or variable tone generation simplifies one-button operation for quick cable identification. The tester functions within a 0–50 °C temperature range for use in varied indoor environments.

How it compares

Measured against everything we stock in Multimeters & Electrical Testers, at today’s prices. Recalculated every night.

Price $45.99
Pricier than about 70% of the 971 comparable items (median $30.99).

Specifications

Product
Brand nameaFe Power
Product typeClamp
Size & build
Overall height3.5 L x 2.7 W x 1.5 H inches
Overall width3.5 L x 2.7 W x 1.5 H inches
Overall length3.5 L x 2.7 W x 1.5 H inches
More details
Team affiliation1 Piece

Questions about this item

What input impedance does the probe present to the circuit under test?

The probe input impedance is nominal 100M Ohm, so it loads the line very lightly while tracing or identifying faults.

What are the exact dimensions of the probe for tool-bag space planning?

The probe measures approximately 231 x 55 x 28 mm (9.1 x 2.2 x 1.1 in) and weighs about 300 g (10.6 oz).

How do I power the kit for the first trace, and what mistake should I avoid?

Install two 9 V batteries (NEDA 1604, JIS 006P or IEC 6LR61) — not included — and never connect the unit to a line carrying strong current.

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