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Internet #307685051

Model #77-050

Store SKU #1004029020

Edge-Detect 3/4 in. Stud Finder

  • Depth detection up to 3/4 in. for wood and metal
  • Auto-calibrating AC detection
  • LED edge detection indicates edges of stud
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Product Overview

The S50 stud finder detects wood and metal studs up to three quarters of an inch below surface material and features auto-calibrating AC detection. With a sturdy design, this stud finder indicates when it senses a wood or metal stud below the wall surface. Sequential LEDs mark both the edges and center of studs with accuracy up to 1/8 in. for wood and 1/4 in. for metal.
  • Detects wood and metal studs up to 3/4 in. beneath surface material
  • Stud center-find indicator for metal and wood
  • Edge detection indicates both edges of the stud with accuracy up to 1/8 in. for wood and 1/4 in. for metal
  • Visual LED indicators on face of stud sensor for easy readability
  • Ideal for mounting TV's, hanging shelves, hanging pictures and demolition work
  • Powered by a 9-Volt battery
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Product Depth (in.)
Product Height (in.)
Product Width (in.)


Audio alert
Batteries Included
Battery Type Required
Detects metal
Detects voltage
Digital Display
No Additional Features
Hand Tool Type
Stud Sensor
Laser level included
Maximum wall thickness (in.)
Number of Batteries Required
Tools Product Type
Hand Tool

Warranty / Certifications

Manufacturer Warranty
Limited Lifetime Warranty

Questions & Answers

Typical questions asked about products:

  • Is the product durable?
  • Is the product easy to use?
  • What are the dimensions of the product?

Customer Reviews

  • 3.6
    out of 204 reviews
  • 79%recommend this product
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Showing 1-10 of 204 reviews
I hope you don't find me rude for being forward, but I purchased one of these exact models and it does not work well at all. It either says the stud is 2 feet wide or it says there is nothing there at all in the same spot. Very inconsistent.
Response from CSDec 1, 2021
Hello ​, We appreciate your feedback on the 77-050 and are sorry to hear about the issue you are having with your product.  This is not the kind of performance we expect from our products and would like to speak to you about this issue so we can assist you in resolving this to your satisfaction.  Please email us at wecare@sbdinc.com and reference ticket # 3385565​. We look forward to hearing from you. STANLEY TOOLS®​ Support
    Great product that does what it's made to do
    [This review was collected as part of a promotion.] I got this product from stanley and had the chance to use it for several weeks for this review. It's like my old stanley stud finder but seems to be more accurate. It's pretty much spot on to the edge. It came in handy putting up new shelves in several rooms this past week. Well made product but after 2 months of moderate use i had to replace the battery. My old one would go longer but it could just be a problem with the battery.
      • Recommended
      Best stud finder I've ever used
      [This review was collected as part of a promotion.] Love the button to activate the sensor is part of the grip. It's easy to use on walls and ceilings , house, garage or eve sheds. Always love the easy to find Stanley yellow color. I am very happy it uses a 9 volt battery as it seems to be a more powerful finder .
        Decent little stud finder.
        [This review was collected as part of a promotion.] Picked up this Stanley stud finder to try out. We are doing some home remodeling and the old stud finder wasn't working right, so we picked up this Stanley 77-050. So far it works as advertised, price is good for a no frills stud finder. There are no sounds, so you will need to watch the lights. For the price, this is a good stud finder.
          • Recommended
          Easy to use with cool pencil marking feature
          [This review was collected as part of a promotion.] This stud finder is a perfect size and is very easy to use. I find the handy notch at the top perfect for marking the wall with a pencil to show the stud edge. The only reason I am not giving this 5 stars is because of the 9V battery connection - when you attach a 9V battery and try to stuff the battery into the compartment, you are forced to bend the wires to an angle that feels like it will cause them to disconnect eventually.
            • Recommended
            Stud Finder
            [This review was collected as part of a promotion.] This Stanley Stud Finder comes in very handy when mounting Tv's and Frames. The thin design is very helpful and fits right in any size hand. The operation is simple and anyone can use it. The Marking Notch helps with labeling when a Stud is found and its edge, the activation button is in a very unique spot where it is easy to press and activates instantly.
              A simple tool to use
              [This review was collected as part of a promotion.] I usually just use rare earth magnets to find studs, and they work very well. However, there are times when I need to find edges of studs. That’s where a tool like this works better. Simple and easy to use for anyone.
                • Recommended
                Basic low cost stud finder
                [This review was collected as part of a promotion.] The Stanley basic (low cost) S50 edge detect stud finder is a simple easy to use tool. Just press the button, wait for the red light to go out and glide the stud finder slowly along the wall. Mark the location where the red light comes on and goes off (the stud location). You should go back and forth several to times to confirm the readings. It uses a 9 volt battery which is not included. The battery is installed without any tools. This is handy for removing the battery when putting it away for an extended period of time. While it is a good basic stud finder, it will not work on all walls. The stud finder worked on five of the seven walls I tested. You may need to try several wall locations (high, middle or low) when initially starting. If the red light will not go out when you start, you may need to move a little sideways to ensure the stud finder is not on a stud. It is easy to blame the machine when it does not seem to be working when the problem may be operator error, like having a hand on the wall during testing. When reading reviews of more expensive stud finders you will see that they also do not work on all walls. I took off one star for this edge detector not working on all walls but maybe my expectations for stud finders are too high.
                  • Recommended
                  Simple and effective
                  [This review was collected as part of a promotion.] Simple edge detector/stud finder. The 9v battery should last ages in this tool. Detects stud edge with ease and accurately. Button is flush but still easy enough to locate and press with either hand.
                    • Recommended
                    Great tool
                    [This review was collected as part of a promotion.] We bought an older house and everytime I thought I would find a stud to hang a picture It was not a stud so I would just end up putting holes in the wall. The studs seem to be just randomly put in my house so this thing is the best and now I can hang things without having to damage my walls with holes. It’s light weight and it’s a great size that fits into your hand.
                      • Recommended
                      Showing 1-10 of 204 reviews