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 TM-507 with LCD display and test leads

TENMARS ELECTRONICS

TENMARS ELECTRONICS TM-507 Insulation Tester 250V 500V 1000V

SKU CH-V0FF-YH1MQ

Tests insulation resistance at 250V, 500V and 1000V up to 4000MO plus AC/DC voltage to 600V and continuity with auto-discharge

  • Labor warranty1 Year
  • Product typeTest Equipment
  • Color and finishRed
  • Number of items1 pack
  • Sold asBox
  • Parts warranty3 Years
  • Tests insulation at 250V, 500V and 1000V with auto range up to 4000 MΩ
  • Measures AC and DC voltage to 600 V with 0.1 V resolution
  • Continuity test with buzzer and 200 mA test current for low resistance
  • CAT IV 600 V safety rating per EN 61010-1 for industrial use
  • Auto discharge, backlit LCD, zero lock and auto power off for field efficiency

Insulation Tester TM-507

The TM-507 is a handheld insulation tester built for electricians and maintenance technicians who verify cable and equipment integrity. It offers three selectable test voltages of 250V, 500V and 1000V with automatic ranging up to 4000MO. The unit meets EN 61557 and EN 61010-1 CAT IV 600V safety standards. A four-digit LCD with backlight supports clear readings in varied lighting.

Replaces manual-range megohmmeters

Upgrading from a single-voltage or manual-range instrument is worthwhile when you regularly test at multiple voltages and need auto-ranging speed. The TM-507 adds AC and DC voltage measurement up to 600V with 0.1V resolution, continuity testing with a buzzer, and a low-ohms function delivering over 200mA test current up to 5O. Auto-discharge and auto power-off protect both the operator and the device.

Check leads and battery before use

Verify that your test leads are rated for CAT IV 600V and show no insulation damage. The meter requires a 9V battery, which is not included in the pack. Confirm the circuit under test is de-energised before connecting for insulation or resistance measurements. Ensure the 605V AC maximum overload protection matches your installation category.

How it compares

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

Price $213.99
Pricier than about 80% of the 5,006 comparable items (median $95.99).

Specifications

Product
Brand nameTENMARS
Product typeTest Equipment
Color and finishRed
In the box
Number of items1 pack

Questions about this item

What test-lead connections does the TM-507 need for its CAT IV 600 V rating?

Use the supplied leads with 605 V AC max RMS overload protection; they plug directly into the front-panel terminals for insulation, voltage and continuity tests.

Which button sequence starts a 1000 V insulation test and locks the reading?

Press POWER, select 1000 V with GO, connect the leads, press GO again to test, then press LOCK to hold the displayed value.

When should the 9 V battery be replaced and what indicates it?

Replace the 9 V battery when the low-battery symbol appears on the 4-digit LCD; the tester will not power on reliably below the minimum voltage.

More in Electrical Trade Tools & Kits

Similar items