If you need to measure insulation resistance, you're probably weighing portability, included accessories, and whether a new or used tester fits your routine. The four options here range from a compact handheld unit to a full kit with test leads and a case, plus two versions of the Fluke 1503 in new and used condition. The right choice depends on the test voltages you need, the extras you want in the box, and your comfort with cosmetic wear on a pre-owned tool.
Quick take
Look at the Uei IRT803 if you want a new tester that comes with silicone test leads, an insulation test probe, and a soft carrying case. Choose the Klein Tools ET600 if you want a new handheld unit with auto-ranging and data hold. Pick the new Fluke 1503 if you want the model in unused condition. Consider the used Fluke 1503 if a lower listed price matters more than a pristine finish.
Listed price comparison
Listed prices for these testers run from $145 to $301.99.
| Product | Listed price | Price bar |
|---|---|---|
| Klein Tools ET600 | $145.00 | |
| Uei IRT803 | $192.42 | |
| Fluke 1503 (used) | $199.99 | |
| Fluke 1503 (new) | $301.99 |
Decision matrix
| Product | Condition | Best suited for |
|---|---|---|
| Uei IRT803 | New | Testers who want the bundled leads and carry case |
| Klein ET600 | New | Field work needing auto-ranging and data hold |
| Fluke 1503 (new) | New | Shoppers who want the Fluke 1503 in new condition |
| Fluke 1503 (used) | Used | Shoppers who are okay with cosmetic wear |
Product notes
Uei IRT803 Insulation Resistance Tester 600V AC/DC, Megohmmeter Measures Insulat
The Uei IRT803 is a new, yellow insulation resistance tester that measures up to 600V AC/DC. The package includes silicone test leads with alligator clips, an insulation test probe with clips, batteries, a manual, and a soft carrying case. That makes it the most complete kit out of the group if you want leads and a case from the start. One limitation: the attributes list a minimum operating voltage of 50 volts, so this unit isn't aimed at sub-50V insulation checks.
Klein Tools ET600 Insulation Resistance Tester - Orange/Black
At the lowest listed price in this group, the Klein Tools ET600 is a new handheld tester with auto-ranging and data hold. The digital display and compact form factor make it easy to keep on a tool belt. The description highlights resistance and AC voltage testing, so it fits well for AC-focused insulation checks. The limitation is that it is designed for AC voltage in insulation systems, which means it may not be the first choice for DC insulation testing.
Fluke 1503 Digital Insulation Resistance Tester / Megger Multimeter
The new Fluke 1503 is a straightforward option if you want this model without prior use. It arrives in new condition and carries the Fluke 1503 model number, so you know exactly which tester you're getting. The listed attributes include the brand and model but show a GTIN of "Does not apply," which means product lookup through that identifier isn't supported. If you rely on GTIN for inventory tracking, the used Fluke 1503 listing with UPCs provides more product code information.
FLUKE INSULATION RESISTANCE TESTER 1503 (P22019407
This is a used Fluke 1503, and the listing describes it as in good overall condition with normal cosmetic wear from regular use, including light scuffs and scratches. It also notes the unit is fully operational. If you want the Fluke 1503 model but prefer a lower listed price than the new unit, this pre-owned version gives you that option. The trade-off is the visible wear, so if you need a tester that looks brand-new, the new Fluke 1503 is the safer pick.
Final recommendation
For a new tester with the most complete accessory package, the Uei IRT803 gives you silicone leads, a probe, and a soft case right away. For a compact new handheld with auto-ranging and data hold, the Klein Tools ET600 is the clear pick, especially if you're focused on AC voltage work. If you want the Fluke 1503 model and prefer new condition, the new Fluke 1503 is the one to choose. If you're comfortable with normal cosmetic wear and want to spend less than the new Fluke, the used Fluke 1503 is worth consideration.
