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PeakTech Two-pole voltage tester, CAT III 400 V review

A battery-free two-pole tester stating CAT III 400 V AC/DC and IP54, with an LED display and an audible warning above 50 V.

What the figures leave us with A complete rating, no battery and an audible threshold. The straightforward choice for domestic work.

A tester that states its rating in full, which is rarer than it should be.

What the manufacturer publishes

A robust two-pole tester stated as suited to professional use in electrical engineering, CAT III 400 V AC/DC, IP54. Battery-free operation, described as always ready to use. A clearly visible LED display and an acoustic warning signal from 50 V.

Battery-free is a specification, not an economy

Every battery-powered test instrument has a state in which it appears to work and does not. A two-pole tester with no cell has no such state: if it indicates, it is because current is flowing through it from the circuit. That is why this design has survived unchanged for decades alongside far more capable instruments.

Where 400 V stops

It covers single- and three-phase domestic and light commercial installations. It does not cover the 1000 V DC of a photovoltaic string or the higher ranges of industrial work — the BENNING in this hub goes to 1000 V AC and 1200 V DC for exactly those jobs.

Availability

No such listing: the American Amazon shop answers the reference with a search box rather than a page.

Read from Keepa on the day this page was last revised; stock and price both move without notice.

What it has, and what it lacks

Strengths

  • States the complete rating: CAT III 400 V AC/DC
  • Battery-free, so it is always ready — the failure mode of a battery tool removed entirely
  • IP54 stated against dust and splashing water
  • An audible warning from 50 V, the threshold at which voltage becomes dangerous

Compromises

  • Four hundred volts, where the Bosch and BENNING here reach 1000 V
  • No self-test function
  • Not found on the British market

Specifications

Amazon referenceB0DY1W4X8M (identical on 5 markets)
EAN4250569407413
Measurement categoryCAT III 400 V AC/DC
Ingress protectionIP54
Powerbattery-free
Functionsaudible warning from 50 V

What gets asked here

How can it work without a battery?

A two-pole tester draws its indication current from the circuit it is testing. That is why it loads the circuit, and why it cannot be fooled by an induced phantom voltage — and it is also why it needs no cell.

Why does the alarm start at 50 V?

Fifty volts AC is the conventional threshold above which voltage is treated as hazardous. PeakTech states an audible signal from 50 V, which turns the instrument into something you can use without looking at it.

Is IP54 enough for site use?

It covers dust and splashing water, which is what a tester meets in a distribution board or a damp cellar. The Bosch in this hub states IP65, which is a step further.

Our score

8.0/ 10

A complete rating, no battery and an audible threshold. The straightforward choice for domestic work.

This one’s price among measuring instruments

A reference exists on these Amazon stores: France, Germany, Italy, Spain, United Kingdom. Listed is not the same as in stock — availability changes daily.

Details checked on August 31, 2026.

Who should pick this one, among measuring instruments

Domestic and light commercial installation work, with the rating printed where you can read it.

Our measuring instruments guides that pick it

What buyers actually choose

Amazon reports what buyers took in the month before this page was last checked: at least 100.

The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.

Sources

Specifications: the manufacturer sheet for measuring instruments and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.

The method applied to these measuring instruments