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Fluke 1503/EX-LEAD Extended Lead Insulation Resistance Meter Kit

Model: 1503/EX-LEAD

Compact, rugged, reliable, and easy to use, this insulation resistance tester features multiple test voltages, which is ideal for many troubleshooting, commissioning, and preventative maintenance applications. Additionally, it comes equipped with a remote probe, test leads, test probes, alligator clips, and 50' test lead.

$476.99 USD

was $529.99

1 to 2 Weeks
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Handle all the basic insulation testing needs with this insulation resistance tester.

Ideal for basic residential and commercial electrical insulation testing, this rugged, compact, and easy to use tool fits in the palm of your hand. You can depend on it to handle the most common tests and additional features, such as the remote probe, decreases the time needed to perform repetitive testing.


  • A rugged, compact insulation resistance tester for residential and commercial electricians
  • Performs insulation tests from 0.01 to 2000 MΩ
  • Offers two insulation test voltages: 500 and 1000 V
  • Includes live circuit detection to prevent insulation test if voltage >30 V is detected
  • Measures resistance from 0.01 to 20.00 kΩ
  • Measures AC/DC voltage from 0.1 to 600 V
  • Includes auto-discharge of capacitive voltage for added user protection
  • Provides lo-ohms earth-bond continuity (200 mA)
  • Simplifies repetitive or hard-to-reach testing with the remote test probe
  • Saves battery power with auto power off
  • Presents results on a large, backlit display
  • Features CAT IV 600 V overvoltage category rating
  • Runs on 4 x AA alkaline batteries (NEDA 15 A or IEC LR6) for at least 1000 insulation tests
  • Save battery power with auto power off


  • Troubleshooting
  • Commissioning
  • Preventative maintenance
6 Tips for effective insulation testing

Disconnect any electronic devices like motor drives, PLC’s, transmitters, etc. before performing insulation testing. Electronics can be damaged by applying higher than normal voltage.


The effect of temperature should be considered - it is recommended that tests be performed at a standard conductor temperature of 20 °C (68 °F) or that a temperature baseline is established while compensating future readings by using a DMM with a probe or an infrared thermometer.


Select a test voltage appropriate for the insulation being tested. The objective is to stress the insulation but not to over-stress it. When in doubt, use a lower test voltage. It’s usually appropriate to test insulation at twice the voltage it normally sees: for example 460 V to 600 V rated equipment is often tested at 1000 V.


When using an insulation tester, leave the leads connected when you stop the test. The insulation tester can discharge any residual test voltage.


Conductors that are close to each other have a normal capacitance. This will cause an insulation resistance reading to start low and increase steadily until it stabilizes. This type of increase is normal, but if the reading jumps violently down and up again this indicates arcing.


Although the current is tightly limited, an insulation tester can generate sparks and minor but painful burns. The unexpected surprise can cause an operator to jerk away. As always, work away from live systems and use safe work practices when working overhead.

Insulation Resistance Testing Solutions

Fluke 1503/EX-LEAD Specifications

AC/DC Voltage Measurement
Accuracy Range: 600 V
Resolution: 0.1 V
50 to 400 Hz ± (%of Rdg + Digits): ±(2% + 3)
Input Impedance 3 MΩ (nominal), <100 pF
Common Mode Rejection Ratio (1 kΩ unbalanced) >60 dB at DC, 50 or 60 Hz
Overload Protection 600 V rms or DC
Earth Bond Resistance Measurement
Range/Resolution 20 Ω:0.01 Ω
200 Ω:0.1 Ω
2000 Ω:1 Ω
20k Ω:0.01 kΩ
Accuracy ±(1.5% + 3)
Overload Protection 2 V rms or DC
Open Circuit Test Voltage >4 V, <8 V
Short Circuit Current >200 mA
Insulation Specifications
Measurement Range 0.01 to 2000 MΩ
Test Voltage 500 V, 1000 V
Test Voltage Accuracy +20%, -0%
Short Circuit Current 1 mA nominal
Auto Discharge Discharge time <0.5 second for C = 1 µF or less
Live Circuit Indicator Inhibit test if terminal voltage >30 V prior to initialization of test
Maximum Capacitive Load Operable with up to 1 µF load
Measure Accuracy 500 V: ±(1.5% + 5)
1000 V: ±(1.5% + 5) to 2000 MΩ, ±(10% + 3) above 2000 MΩ
Click here for complete specifications on the Fluke 1503/EX-LEAD

What's included with the Fluke 1503/EX-LEAD

  • Insulation Resistance Tester
  • Remote Probe
  • 50' Test Lead
  • Test Leads
  • Test Probes
  • Alligator Clips
  • User Documentation
  • One Year Warranty
Fluke 1587 FC Insulation Multimeter Fluke 1577 Insulation Multimeter Fluke 1503 Insulation Resistance Meter Fluke 1507 Insulation Resistance Tester Fluke 1550C Insulation Resistance Tester Fluke 1555 Insulation Resistance Tester
Two in one tools Stand-alone tools
Insulation test features 1587 FC 1577 1503 1507 1550C 1555
Test voltages 50 V, 100 V, 250 V, 500 V, 1000 V 500 V, 1000 V 500 V, 1000 V 50 V, 100 V, 250 V, 500 V, 1000 V 250 V to 5000 V 250 V to 10,000 V
Insulation resistance range 0.01 MΩ to 2 GΩ 0.01 MΩ to 600 GΩ 0.01 MΩ to 2000 GΩ 0.01 MΩ to 10 GΩ 250 kΩ to 1 TΩ 250 kΩ to 2 TΩ
Auto discharge
Timed ramp test (Breakdown)
Pass/fail comparison
Est. # of IRT tests 1000 1000 2000 2000 Various Various
Voltage > 30 V warning
Memory With Fluke Connect App
Remote test probe
Lo ohms/earth-bond continuity 200 mA source (10 mΩ resolution) 200 mA source (10 mΩ resolution)
Display Digital LCD Digital LCD Digital LCD Digital LCD Digital LCD/ analog display Digital LCD/ analog display
Multimeter features
AC/DC volts

Note: Not all product features and specifications are listed in this table. For more complete information, see individual product data sheets.

1. Function useful for checking connections and motor windings. Also useful for users who are required to perform earth-bond continuity measurements during installation testing.
2. Filter for variable-speed motor drive measurements.

Continuity beeper
Temperature (contact)
Lo-pass filter2
Diode test
Other features
Software Fluke Connect compatible FlukeView® Forms Basic Fluke View® Forms Basic
Battery 4 AA (NEDA 15A or IEC LR6) 4 AA (NEDA 15A or IEC LR6) 4 AA (NEDA 15A or IEC LR6) 4 AA (NEDA 15A or IEC LR6) Rechargeable Rechargeable
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Customer Reviews for the Fluke 1503/EX-LEAD