When you need to confirm that motor windings, cables, and wiring insulation are sound, the decision usually narrows to two insulation resistance testers: the Fluke 1503 and the Amprobe MegaTest 1 AMB-45. Both are handheld megohmmeters electricians and maintenance techs can use, but they take different approaches to price, included accessories, and measurement range. Here is a head-to-head look to help you pick the one that fits your toolbox.
Quick Verdict
If your focus is insulation resistance testing, the Fluke 1503 is the focused, get-it-done pick. If you prefer a multi-function tester for broader electrical troubleshooting, the Amprobe AMB-45 is the more capable all-rounder. Both are used units in working condition, so factor that into your decision.
At a Glance
| Product | Price | Condition | What's included | Price position |
|---|---|---|---|---|
| Amprobe MegaTest 1 AMB-45 | $399.97 | Used | Original carrying pouch, red/black test leads, extra cable, manual, and CD | |
| Fluke 1503 Insulation Resistance Tester | $199.99 | Used | All cords, cables, connectors, and attachments as included by factory |
Where Each Product Wins
Choose the Fluke 1503 if you want a straightforward insulation resistance tester that is ready to use. The unit is fully functional and its factory cables are complete.
Choose the Amprobe AMB-45 if you want one meter that can move between insulation checks and broader electrical troubleshooting. The extra measurement modes give it more flexibility.
Product Notes
Fluke 1503 Insulation Resistance Tester
The Fluke 1503 is the focused option. It is a used insulation resistance tester in good overall condition: the unit has been tested and is fully functional, with light scuffs and scratches on the housing from regular use. Its factory cords, cables, connectors, and attachments are complete, so it is ready for insulation checks on motors, cables, and wiring panels. If you already own a separate multimeter for everyday electrical work, this tester fills the insulation-testing gap cleanly. The limitation is the visible wear: scuffs and scratches are normal for a tool that has been handled, but they are there. It is a straightforward, task-specific buy.
Amprobe MegaTest 1 AMB-45
The Amprobe MegaTest 1 AMB-45 swings the other way: it is a multi-function insulation tester. On top of insulation resistance readings, it measures voltage, resistance, frequency, temperature, and capacitance, with auto power off and over range protection. The kit is what makes it stand out-original carrying pouch, red and black test leads, an extra cable, manual, and CD are all included. That is a strong reason to choose it if you want one meter for both insulation checks and broader electrical troubleshooting. What holds it back is that it is a used unit, so it shows minor smudges from handling; the screen is crisp, but the outside carries normal handling marks. It is still in good working order, just not a brand-new-looking tool.
Final Choice by Use Case
Think about what else is in your toolbox. If a separate multimeter is already there, the Fluke 1503 complements it. If you want one meter to move from insulation tasks to routine electrical checks, the Amprobe AMB-45 is the one.
For dedicated insulation testing: Fluke 1503 Insulation Resistance Tester.
For a multi-function field meter: Amprobe MegaTest 1 AMB-45.
