Testo 750-1 Voltage Tester – 12…690 V AC/DC, All-Round LED Display, Continuity and Rotary Field Test, CAT IV (0590 7501)

Testo 750-1 (product code 0590 7501) is a two-pole voltage tester used for testing electrical systems and equipment. It performs voltage tests in the range 12 … 690 V AC/DC and has a patented all-round LED display readable from any position using fiber-optic technology. It is suitable for reliably determining the absence of voltage and power, continuity testing and rotary field checks in switch cabinets. It complies with the EN 61243-3 standard.

All-Round LED Display Readable from Any Angle

The main difference between the Testo 750-1 and standard voltage testers is its all-round LED display, which is clearly visible no matter at what angle the instrument is held; the fiber-optic design makes the voltage indication stand out. The non-slip ring, ergonomic shape and robust housing provide comfort and durability in intensive use.

It is the basic model of the Testo 750 family. For those who want a numerical value on an LC display, single-pole phase testing, RCD tripping and a flashlight, the Testo 750-3 model of the same family is available.

Technical Specifications (Official Testo Data)

• Brand / Model: Testo 750-1 voltage tester · product code 0590 7501
• Voltage Test: 12 … 690 V AC/DC · accuracy according to DIN EN 61243-3:2014
• Continuity Test: < 500 kΩ
• Rotary Field Test: 170 … 690 V phase-to-phase, 50/60 Hz
• Display: fiber-optic all-round LED display
• Measurement Category: CAT IV 600 V · CAT III 690 V
• Protection Class: IP64
• Power Supply: 2 × AAA batteries
• Operating / Storage Temperature: −10 … +50 °C / −15 … +60 °C · operating humidity 0–95% RH
• Dimensions / Weight: 270 × 65 × 35 mm · 235 g
• Approval / Standard: TÜV, CSA, CE · EN 61243-3 · EN 61326-1 · EN 61010-1

Scope of Delivery

• Testo 750-1 voltage tester
• Test probe protector and test probe caps
• Batteries
• Test protocol and instruction manual

Technician Tips

• Test on a known source before use: before verifying the absence of voltage, test the instrument on a socket known to be live, and test it again after measuring.
• Check the phase sequence on compressors and fans: verify the phase sequence with the rotary field test before connecting a three-phase motor; a reversed phase causes reverse rotation.
• Disconnect power for continuity: carry out continuity tests on contacts, fuses and cables with the circuit de-energized.
• Fit the probe caps: work with the test probe caps in a CAT IV environment; do not use an instrument with damaged probes.
• Check the battery condition: weak batteries affect the test functions; remove the batteries if the instrument will not be used for a long time.

Technical document: Testo 750 voltage tester datasheet (PDF, English)