Measuring the exact voltage with the current tester

The electrical tester measures the voltage which is present and it is suitable for both AC and DC voltage. As a multimeter it also determines other measurement data, in addition to the exact level of voltage. Automatic detection means the instrument is suitable for virtually all electrical areas, without the need for any switching.

The advantages of the current / voltage testers testo 755

  • Reliable voltage display, even with an empty battery
  • Measure immediately without any switching on or selection
  • Exchangeable measuring tips

Current / voltage tester testo 755 in comparison

  • Current / voltage testo 755-1
    • Current / voltage testo 755-1
  • testo 755-1, current/voltage tester including batteries and measuring tips
  • Order no. 0590 7551
  • Voltage: 6 to 600 V
  • Current: 0,1 to 200 A
  • Resistance: 1 Ω to 100 kΩ
  • Continuity testing: < 50 Ω
  • Rotating magnetic field testing: -
  • Single pole phase testing: -
  • Measurement category: CAT IV 600 V; CAT III 1000 V
  • Current / voltage testo 755-2
    • Current / voltage testo 755-2
  • testo 755-2, current/voltage tester including batteries and measuring tips
  • Order no. 0590 7552
  • Voltage: 6 to 1000 V
  • Current: 0,1 to 200 A
  • Resistance: 1 Ω to 100 kΩ
  • Continuity testing: < 50 Ω
  • Rotating magnetic field testing: 100 to 690 V
  • Single pole phase testing: 100 to 690 V
  • Measurement category: CAT IV 600 V; CAT III 1000 V


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The current tester for important measurements

The measuring instruments generally have exchangeable measuring tips, making them easier to handle. There is therefore no need to replace the whole instrument when there is any damage. An integrated light also means unfavourable light conditions are not a problem, as the light shows the measurement results clearly. The classic electrical tester enables the following measuring tasks to be carried out: 

  • checking electrical systems for a specific voltage or the absence of voltage,
  • measuring current flow,
  • determining current consumption,
  • carrying out continuity testing.
Current tester

Testing current safely – with the right instruments

A variety of instruments can be used to test the voltage. A professional voltage tester not only enables you to get information about the presence of a voltage, but also to determine the resistance and other measuring values. In principle, the electrical tester has the task of checking the voltage present. This is intended to prevent any possible risks during forthcoming work.

Voltage testers are available as measuring instruments for low and high voltages. The low voltage range goes up to a value of one kilovolt. The high voltage range is primarily found in the industrial environment.

When deciding on an electrical tester, you have the following products to choose from: 

With the two-pole voltage tester you get an instrument that provides particularly precise measurement data. The two test electrodes are permanently fixed onto the measuring instrument. This control unit has an easily visible display and its ergonomic shape makes it easy to hold securely. In order to protect the voltage tester and the user, the instrument is equipped with a variety of series resistors. They restrict the test current, so that the voltage of the measurement system is divided down. In order to carry out a measurement, you touch two different cables or other potentials with the test electrodes. You then read out the latest voltage values on the display.

Voltage tester, phase tester and clamp meter

Current testers from Testo – for your safe use

Testo current testers are characterized by reliable measurement and voltage display, even when the battery is empty. The instruments do not have to be switched on specially and work without any pre-selection. The measuring instruments bear the appropriate seals of approval for safety.

If necessary, you simply replace the measuring tips to ensure you can then continue to test the current safely. The electrical tester carries out an automatic detection of the electrical parameters, which means no separate selection is needed.

Testo has two current testers available for you, which both provide a reliable result and impress with their versatile capability:

  • the testo 755-1 current/voltage tester, with batteries, measuring tips and measuring tip caps,
  • the 755-2 with a larger voltage range up to 1000 volts.
Current testers from Testo

The electrical tester for precision measurement

In comparison to other voltage measuring instruments, the two-pole test instruments impress with their multi-functional capability and their accurate results. There are measurement categories for voltage testers which are intended to ensure optimum personal protection. Since 2011, the instruments have to be from at least category III. CAT III two-pole voltage testers are reliably protected against overvoltage and therefore also withstand a short circuit.

Testo's voltage testers are very convenient and safe to operate, thanks to their handy size and a weight of 306 grammes. They are suitable for an operating temperature of between -10 and +50 degrees Celsius and have protection class IP64.

The following technical data apply to both Testo's current testers: 

  • the measuring range is 6 to 600 V or 6 to 1000 V, depending on the instrument,
  • the resolution is 0.1 V,
  • the precision for AC and DC is ± 1.5% of measured value + 3 digits.
Eectrical tester Testo

Testing currents: what you need to keep in mind

When you test the current with Testo instruments, you can rely on the voltage testers detecting dangerous voltages straight away. In addition, incorrect operation is virtually impossible due to the simple design. The current tester does not endanger you in any way and is designed so that any risk during operation is extremely low. There is no possibility of either electric shocks or arc faults occurring. The measurement categories CAT IV for 600 V and CAT III for 1000 V mean user safety is maintained.

You always operate the voltage testers with two hands, which means you avoid accidentally touching the test electrodes which are energized. In addition, the test instruments meet the strict safety requirements and bear the TÜV, CSA and CE seals.

Before you test the voltage, a function test is worthwhile. To do this, you hold the instrument on a current source that is already known and check whether the display is correct. The following help you both with this process and with the actual current testing:

  • measuring point illumination by LED,
  • digital display.