We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Red handheld insulation tester DT-5505 with large dual-display backlight

CEM

CEM DT-5505 insulation tester 125V 250V 500V 1000V 4000MΩ dual display backlight

SKU CH-EF4G-FGVAQ MPN DT-5505

Tests insulation at 125, 250, 500 and 1000V up to 4000MΩ with dual backlit display and auto-discharge protection

  • Labor warranty1 Year
  • Product typeTest Equipment
  • Color and finishRed
  • Number of items1 pack
  • Sold asBox
  • Parts warranty3 Years
  • Test up to 4000 MΩ with 1 kΩ resolution
  • Four test voltages: 125 V, 250 V, 500 V, 1000 V
  • 1 mA test current at rated voltage
  • Auto-discharge of capacitive voltage after test
  • Live-circuit detection blocks test above 30 V

Insulation tester with four voltages

The CEM DT-5505 is an insulation tester built for electricians and maintenance engineers who need to verify dielectric strength on cables, motors and switchgear. It offers selectable test voltages of 125V, 250V, 500V and 1000V with a measurement range up to 4000MΩ. A large dual display with backlight shows readings clearly in dim environments. The instrument is supplied new in a single box.

Sustained-load behaviour with auto-discharge

During prolonged testing the unit maintains a 1mA test current at the rated voltage to charge capacitive loads without sagging. Auto-discharge releases stored capacitive voltage after each measurement, protecting the operator and the device under test. Live-circuit detection blocks the insulation test if more than 30V is present on the circuit, preventing accidental energised measurements. Min/Max recording and Data Hold capture the highest and lowest values across extended test sessions.

Installation notes and common pitfalls

The tester ships without batteries because air-freight regulations forbid them in the package; users must source suitable cells locally before first use. No English manual is included in the box, so operators should request documentation from customer service after purchase. Ensure test leads are rated for the selected voltage and that the circuit is fully de-energised before connecting, as the >30V lockout will inhibit the test otherwise.

How it compares

Measured against everything we stock in Electrical Trade Tools & Kits, at today’s prices. Recalculated every night.

Price $169.99
Pricier than about 73% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand nameCEM
Model nameDT-5505
Product typeTest Equipment
Color and finishRed
In the box
Number of items1 pack

Questions about this item

How hot or noisy does the DT-5505 get during continuous insulation testing?

The DT-5505 has no fan; it runs silently and stays cool during all-day use because it only draws current when the test button is pressed.

What must I already own to power the DT-5505 and start testing?

You need to supply your own batteries; the package ships without them due to air-freight restrictions.

Will the DT-5505 safely test circuits that still have older wiring energised at low voltage?

Live-circuit detection blocks the insulation test if more than 30 V is present, and auto-discharge removes stored capacitive voltage after each test.

More in Electrical Trade Tools & Kits

Similar items