Amprobe ST102A Socket Tester with GFCI

  • Test GFCI breakers for proper wiring and operation
  • Easy to read light indicators show common wiring problems
  • Confirm GFCI socket is wired for protection
  • GFCI circuit trips to confirm tester is working
  • For use on 110-125 V AC




Quickly test sockets and confirm GFCI breakers are properly wired for protection with the ST102A.


AC Voltage 110 V → 125 V 110 V → 125 V
Rated operating Voltage: 110 – 125 V AC
Wattage: 0.3 W
Actuator: Black button
Indicator: Red LED
Indicator lamps: Three, incandescent
Lamp lens colors: One red, two amber
Six conditions indicated: Open ground, open neutral, open hot, hot/ground reverse, hot/neutral reverse, correct


What’s Included

  • ST102A


Product Manual »

27 reviews for Amprobe ST102A Socket Tester with GFCI

  1. John

    socket tester

    I bought this with the Amprobe PM-60 in a kit. I have not been able to try the PM-60 but the siocket tester works great. the kit also came with the VT201A which I have no idea how to use. the directions packet only covers use of PM-60. this product kit needs a better cunsumer use manual.

    ✔ Yes, I recommend this product.

  2. UphappyPurchaser

    Buy at your own risk

    This item was purchased in a PK100R Electric Test Kit. One item in the kit had a user manual included. This item (socket tester) had no information….none….zero…..nada….on its use. O
    An on-line search of the site was useless. No user manual available there. If you don’t already know how to use this item, don’t buy this kit. The company has nothing in the kit that is the least bit helpful. Whatever help I have gotten was from a general home repair publication at my local home supply store. I am taking the whole kit back tomorrow.

    ✘ No, I do not recommend this product

  3. Amprobe

    Thank you for your review. The instructions for the ST102A Socket Tester are printed directly on the label of the product which advises you if an electrical socket is wire properly or if it has a specific wiring problem such as reversed wiring, open grounds, etc.

  4. Brandon86

    Works Great very helpful

    Great product to have when testing outlets that don’t work, also great for following behind others work

    ✔ Yes, I recommend this product.

  5. Ike2

    This tool really hods up

    Mine has worked great and has held up to the abuse in the tool pouch and drops.

    ✔ Yes, I recommend this product.

  6. BonafideElectric

    Professioanl Product For the Professional

    This Receptical Tester is geared for the professional electrician. Professional grade PERIOD. It will definitely last.

    ✔ Yes, I recommend this product.

  7. Paul64

    Quick solution for circuit test

    This tool makes it easy to check all the information you need to see if the circuit is working properly. Works much better than my old checker.

    ✔ Yes, I recommend this product.

  8. stevieboy0923

    A must have tool. No kidding.

    This tool is very simple to use.As a home owner or handyman this tool is a must in your tool bag! Very durable and takes up almost no room at all! Plug it in and read your results!

    ✔ Yes, I recommend this product.

  9. pretrip386


    It was very helpful when trying to get the outlet to work right….and make sure it was working properly!! Right now my son has it and he thinks it’s great to use when remodeling his workshop..

    ✔ Yes, I recommend this product.

  10. clyde

    i use it all the time

    I have used this tool so many times it saved ne hundreds of dollars on the power bills

    ✔ Yes, I recommend this product.

  11. comonback10

    amprobe socket tester

    This is a great product. I borrowed one to use cause my wall sockets weren’t working. Tested them one out of the four were bad so had to change one outlet by using the amprobe socket tester saved alot of time and work. I recommend having one in your tool pouch. I have one now handy tool.

    ✔ Yes, I recommend this product.

  12. MattH757

    Very Reliable Tester

    I bought this to check the wiring in my historic home after I purchased and used this to easily identify wiring mistakes by a shody DIY job from the previous owners. Excellent and super reliable product.

    ✔ Yes, I recommend this product.

  13. DAH11244

    Easy to use

    Very handy to have around the house and easy to use.

    ✔ Yes, I recommend this product.

  14. HerDarlene

    Works Great – Instructions Need Improvement Though

    For the DIY’er this is a great product. As a first time home buyer of a foreclosure, not having the ability to get a full inspection was one of the worries of our purchase. However our electrician friend walked us through the entire house, and showed us what was working properly and what needed fixing/replacing immediately.

    His magic bag of electrician tools was packed full of AMPROBE tools. I had asked him if he won a contest or something like that because of all the same branded tools, he replied with “Heck No, I Bought All Of This On My Own, These are EXTREMELY reliable and durable tools!!”

    He showed me which devices did what to the various things in our home, and on the last day before he was done, he told me that there was a present out on the breaker box for me.

    He put a ribbon on this socket tester and a breaker tester with a note saying “Happy House Warming”!

    ✔ Yes, I recommend this product.

  15. daiseygirl66

    a real life saver…

    we moved into an older house and was having lots of problems with some of the outlets…my dad suggested we get a socket tester to help find the problems…I bought this one and it was easy to use and saved my husband a lot of work…would recommend for any one…

    ✔ Yes, I recommend this product.

  16. CompuCurt

    Great tool to have in your pocket or pouch

    I have used some cheaper knock-offs and one was almost deadly… reported oposite than what was wired. I found the display and codes easy even for one that is getting up there in the years. Light to add to the tool pouch. Recommend this to a friend.

    ✔ Yes, I recommend this product.

  17. Pauley

    Fast, Simple & Reliable

    Simply the quickest method for checking GFCI wiring and verify outlet power. Wouldn’t be without one and no batteries!

    ✔ Yes, I recommend this product.

  18. EZgoing

    .Quality doesn’t cost, it pays

    Over the years, I’ve had or used several Amprobe test tools. Anything from the multi testers, ampere testers, to circuit breaker tracers and their receptacle socket testers… I have yet to find any of their tools that have failed to perform as expected. All are well built, built to handle every day usage and accurate. Quality doesn’t cost, it pays.

    ✔ Yes, I recommend this product.

  19. Paul

    Excellant for trouble shooting

    Twice this product has helped me rouble shoot a faulty GFCI circuit that was otherwise a painful experience. After several days of trying to find a faulty outlet, this product showed me that it was actually just a loose connection and paid for itself.

    ✔ Yes, I recommend this product.

  20. candyman13

    this product is great for home safety.

    this is a great product for testing your house for any faulty wiring and to keep your electrical soackets working at max testing your sockets periodicly every 6 to 12 months this product is perfect for exactthat easy to use and easy to read your home will be safe from any electrical accident with this devce.

    ✔ Yes, I recommend this product.

  21. jimbob

    this tool is well worth purchasing

    the tool is very dependable and self explanatory in readout. does not require a users manual. I highly recommend this tool.

    ✔ Yes, I recommend this product.

  22. Sparky2825

    Great quality tool!

    I am a commercial electrician and have been on large jobs were i use this tester hundreds of times in a week. I have several of these same testers for countless years now no problems, the gfci feature is nice too. This works perfect and holds up to some rigorous abuse in my tool bag. With multiple i can quickly track down circuits. A very simple tool i would not work without.

    ✔ Yes, I recommend this product.

  23. Mark1960

    Must have tool for your electrical tool kit.

    Excellent tool for quick tests of circuits. I have used this socket tester both professionally in a new construction residentual setting as well as in my own home. Three light display provides a reliable accurate analysis of the condition of the circuit.

    ✔ Yes, I recommend this product.

  24. shopgator

    Great tool box buddy for DIYers

    I had the occasion to track down a bad recepticle in my shop and replace it one day. This little gadget, picked up a yard sale, (I recognized the Amprobe name and snatched it up) made my day so much easier. I was able to pop it in to each recepticle socket and was not only able to quickly find the culprit, but I was reassured that the circuit was off before swapping it out by checking a recepticle in line with the bad one. I would definitely recommend this product. Thank you Amprobe.

    ✔ Yes, I recommend this product.

  25. skipper

    This product if user friendly

    I have one of these socket testers. I find this device to be very reliable and of good quality and price.

    ✔ Yes, I recommend this product.

  26. ace42

    its quick and fast and efficient

    it works as soon as it’s plugged in to any outlet and bam your results are there.

    ✔ Yes, I recommend this product.

  27. saintdoggx

    Excellent Product!!

    We’ve been using this GFCI tester for years and it hasn’t failed us once. All the lights work every time we use it and it completes the job. We rely on Amprobe for all of our GFCI testing every time. It’s a brand we can trust and a brand we will continue to use. Great product! Excellent! Definitely recommend!!

    ✔ Yes, I recommend this product.

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