When you're shopping for multimeters and electrical testers, the biggest question is usually how much insulation-testing capability you actually need. The four options here range from $39.89 to $611, so the decision is as much about budget and condition as it is about test voltage and extra functions.
Quick take
The lineup splits neatly by price and purpose. The BTMETER Digital Megohmmeter 2000MΩ is the lowest-price entry, with selectable insulation test voltages and a CAT II rating. The Amprobe MegaTest 1 AMB-45 is a multifunction tester. The Fluke 1503 is a Fluke model in the middle of the range. The Fluke 1507 is the highest-price option, a new open-box unit with a broad insulation-test range.
Listed-price comparison
| Product | Price | Condition | Price bar |
|---|---|---|---|
| BTMETER Digital Megohmmeter 2000MΩ | USD 39.89 | New | |
| Amprobe MegaTest 1 AMB-45 | USD 399.97 | Used | |
| Fluke 1503 | USD 199.99 | Used | |
| Fluke 1507 | USD 611.00 | New open box |
Decision matrix
| If you need... | Best fit | Why |
|---|---|---|
| A low-cost insulation tester for basic checks | BTMETER Digital Megohmmeter 2000MΩ | 250/500/1000 V test voltages, AC voltage range, and a shoulder strap for portability. |
| One handheld unit for multiple electrical measurements | Amprobe MegaTest 1 AMB-45 | True RMS plus resistance, frequency, temperature, voltage, and capacitance readings. |
| A Fluke insulation tester without the top price | Fluke 1503 | Fully functional used condition with all cords and attachments included. |
| The full insulation-test capability | Fluke 1507 | 50-1000 V, PI/DAR calculations, compare/pass-fail, and live-circuit detection. |
Product notes
BTMETER Digital Megohmmeter 2000MΩ
The BTMETER is the lowest-price option in this group. It provides selectable 250 V, 500 V, and 1000 V insulation test voltages, an AC voltage range up to 750 V, and a CAT II rating. The backlit LCD, data hold, and LOCK function make it easy to keep a measurement running hands-free, and the shoulder strap helps on site. The 1999-count manual range is simple rather than auto-ranging, and the 200 MΩ low-voltage ranges are far smaller than the 2000 MΩ range at 1000 V. For basic insulation checks and AC voltage verification, this is a direct, low-cost tool.
Amprobe MegaTest 1 AMB-45
The Amprobe MegaTest 1 AMB-45 is a used multifunction insulation tester that comes with its original carrying pouch, red/black test leads, an additional cable, manual, and CD. Its standout reason to choose it is the range of measurements: resistance, frequency, temperature, voltage, and capacitance, with true RMS and auto power off. That makes it more than just a megohmmeter for someone who wants a broader handheld tester. The limitation is that it is pre-owned and sits near the top of this price range, so the condition of the included accessories matters. Cosmetic smudges from normal handling are part of the used condition.
Fluke 1503 Insulation Resistance Tester
The Fluke 1503 offers a way into Fluke insulation testing at a moderate price. It is fully functional, with a 93% Very Good condition assessment, and it includes all cords, cables, connectors, and attachments originally included, though the original box may or may not be present. If you want a Fluke insulation tester without paying the top price, this is the balanced pick. The trade-off is that the unit has normal cosmetic wear from regular use, including light scuffs and scratches. It is also a used unit rather than new or new open box, so the condition assessment is a bigger part of the decision than it would be for a brand-new tool.
Fluke 1507 Insulation Resistance Tester
The Fluke 1507 is the new open-box unit at the top of the price range. Its reason to choose it is capability: it covers insulation test voltages from 50 V to 1000 V, measures up to 10 GΩ, and automatically calculates polarization index and dielectric absorption ratio. It also adds a compare/pass-fail function, live-circuit detection, and auto-discharge of capacitive voltage, plus NIST-traceable calibration. If you need a wide test voltage range and a full set of insulation-analysis features, this is the unit to budget for. The limitation is the price, which is higher than every other option here, and the fact that it is open box even though the unit itself is new.
Final recommendation by use case
- For basic insulation checks on a tight budget, the BTMETER Digital Megohmmeter 2000MΩ is the pick at the lowest listed price.
- For one handheld unit that handles insulation resistance plus general electrical measurements, the Amprobe MegaTest 1 AMB-45 is the multifunction pick with its included carrying pouch and leads.
- For a Fluke insulation tester at a mid price, the Fluke 1503 is the practical used choice.
- For broad insulation-test capability and advanced diagnostics, the Fluke 1507 is the new open-box unit to choose.
