Klein Tools
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RT250 tester only (no pen)
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Find on AmazonModel: RT250
The single GFCI receptacle tester with LCD; no voltage-tester pen, pouch or extra batteries.
Important limit: North American 3-wire 120V outlets only; it cannot test 240V or non-US sockets
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Compare versions and packagesSpecifications checked November 5, 2026. Full product details
Tester, 2 x 1.5V AAA alkaline batteries, manual
Klein Tools RT250 GFCI Receptacle Tester with LCD
A plug-in receptacle tester for North American 3-wire 120V outlets with a backlit LCD that shows line voltage, wiring-fault codes and the time it takes to trip a GFCI device.
Selected package: RT250 tester only (no pen).
Model: RT250
Adds the NCVT3P dual-range non-contact voltage tester, a storage pouch and batteries.
These are different products. Check their specifications separately.
LED lights only; no LCD readout of voltage or GFCI trip time.
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| Type | GFCI receptacle tester |
|---|---|
| Application | Detects and identifies common wiring problems in GFCI receptacles |
| Voltage | 135V AC; for use on 3-wire North American 120V outlets only |
| Display | Large backlit LCD showing voltage, wiring condition and GFCI trip time |
| GFCI trip test | LCD shows the time required to trip a GFCI device |
| Wiring faults | Detects common wiring faults, with patent-pending detection of open neutral / open ground |
| Indicators | Bright green and red LEDs plus the LCD readout |
| Auto-Hold | Holds the reading for hard-to-reach outlets |
| AFCI test | No |
| Drop protection | 6.6 ft (2 m) |
| Safety rating | CAT II 135V |
| Batteries | 2 x AAA (included) |
| Included | Tester, 2 x 1.5V AAA alkaline batteries, manual |
| Size | 4.5 x 2 x 1.1 in (11.4 x 5.1 x 2.8 cm) |
| Weight | 4.8 oz (136 g) |
From manufacturer documentation, checked November 5, 2026. Spotted an error? Tell us.
A pen-style non-contact AC voltage detector that senses 90 to 1000 V AC, glows red and beeps near live conductors, runs a continuous self-test and is rated CAT IV 1000V.
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