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Calculated Industries 8105 Blind Mark Drywall Electrical Box Locator ToolMerchant Video
  • Calculated Industries 8105 Blind Mark Drywall Electrical Box Locator Tool
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Calculated Industries 8105 Blind Mark Drywall Electrical Box Locator Tool

4.3 out of 5 stars 3,151 ratings
Lowest price in 30 days
To see product details, add this item to your cart. You can always remove it later.

Purchase options and add-ons

Brand Calculated Industries
Colour Multi
Style Modern
Material Multi
Item weight 1 Pounds

About this item

  • Perfect drywall cutouts in half the time with NO measuring using powerful rare-earth magnets
  • Twice as easy and only half the lifting of other marking methods
  • Get professional results you can be proud of your first and every time with foolproof patented technology
  • Pays for itself by avoiding costly and embarrassing measuring errors. Handy rugged case stores, organizes and protects all parts between projects
  • 3 included Targets fit standard single or multi-gang plastic boxes for any NEW construction installation; For receptacles in place, see Plug Mark

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Calculated Industries 8105 Blind Mark Drywall Electrical Box Locator Tool
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Calculated Industries 8115 Multi Mark Drywall Cutout Locator Tool – Powerful Rare-Earth Magnetic Targets (2) and Locator Kit
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From the manufacturer

BMXT
BMXT

Precisely locate electrical boxes without measuring

BM

Twice as easy - with no measuring

All you have to do is insert the target into the outlet box with the arrow on the target pointing up and then install your drywall. Next, confirm the directional arrow on the back of the locator is also pointing up and then slide the locator over top of the target location. The locator will snap into place. With the box located you simply mark the drywall over the box, cut out the access hole and you are done - perfectly.

BM

Find and mark hidden boxes

No more lifting and lowering heavy drywall sheets multiple times. In three easy steps you'll be done: Just insert the Blind Mark targets into your electrical outlet box with the directional arrow pointing up. Install the drywall. Slide the locator over the drywall with the arrow on its backside pointing up until it snaps over top of the target and then cut the hole in the sheetrock.

BM

Ideal for the remodeler and DIY

The Blind Mark XT comes with 3 target magnets, 1 target locator magnet, and a rugged carrying case.

Blind Mark XL Model 8105
Center Mark Model 8110
Multi Mark Model 8115
Plug Mark Model 8120
Buying Options
Customer Reviews
4.3 out of 5 stars 3,151
—
4.3 out of 5 stars 1,230
4.4 out of 5 stars 699
Use for locating single-gang or multi-gang boxes ✓ - no data ✓ ✓
Use for locating 4", 5" or 6" recessed light fixture openings - no data ✓ - no data - no data
Use for locating receptacles that have already been installed - no data - no data - no data ✓
Use for locating various box sizes including octagon, rectangle, standard or thin - no data - no data ✓ - no data
Comes with rugged case ✓ - no data - no data - no data
Number of Targets Included 3 2 2 2
Use on multiple kinds of materials ✓ ✓ ✓ ✓
BMXT

Product information

Technical Details

Manufacturer ‎Calculated Industries
Place of Business ‎CARSON CITY, NV, 89706 US
Part Number ‎8105
Product Dimensions ‎26.04 x 12.07 x 3.18 cm; 453.59 g
Item model number ‎8105
Is discontinued by manufacturer ‎No
Colour ‎Multi
Style ‎Modern
Material ‎Multi
Item Package Quantity ‎1
Number of Pieces ‎1
Included Components ‎Includes 3 target magnets, 1 target locator magnet, and a rugged carrying case
Batteries Included? ‎No
Batteries Required? ‎No
Item Weight ‎454 g
Country of origin ‎China

Additional Information

ASIN B00YX8KZGO
Customer Reviews
4.3 out of 5 stars 3,151 ratings

4.3 out of 5 stars
鶹 Rank
Date First Available June 14 2015

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Calculated Industries 8105 Blind Mark Drywall Electrical Box Locator Tool

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Product description

Perfect drywall cutouts in half the time with NO measuring using powerful rare-earth magnets;Twice as easy and only half the lifting of other marking methods;Get professional results you can be proud of your first and every time with foolproof patented technology;Pays for itself by avoiding costly and embarrassing measuring errors;3 included Targets fit standard single or multi-gang plastic boxes for any NEW construction installation; For receptacles in place, see Plug Mark

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Customer reviews

4.3 out of 5 stars
3,151 global ratings

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Customers say

Customers like the ease of use, effectiveness, and time-saving of the pest control device. They mention it makes the job so much easier, makes finding work very easy, and works perfectly on North American Style Outlets. Customers also appreciate the value for money. However, some customers have mixed opinions on the magnetic strength.

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Ease of useEffectivenessMeasurement easeTime-savingValue for moneyMagnetic strength
24 customers mention "Ease of use"24 positive0 negative

Customers like the ease of use of the pest control device. They mention it makes the job so much easier, is incredibly simple, and effective. Customers also say it saves alot of time installing drywall and is the easiest way to locate gang boxes.

"Easy to use and easy to find… also to make the hole on the right place" Read more

"Great tool, big efficiency gains..." Read more

"it saves alot of time installing drywall - way less measuring for electrical boxes .." Read more

"...but still easily covered by the outlet cover and easy to adjust for further cutouts...." Read more

17 customers mention "Effectiveness"17 positive0 negative

Customers are satisfied with the effectiveness of the pest control device. They mention it works awesome, works perfectly on North American Style Outlets, and is a fantastic product.

"Love it. Works as it says and saves me time and measuring...." Read more

"This product works as described...." Read more

"...Other then that they work perfect an have been bang on every time." Read more

"...Doesnt work even on 1/4 drywall. It s work, but miss up to 3/4" every time." Read more

6 customers mention "Measurement ease"6 positive0 negative

Customers like the measurement ease of the pest control device. They mention it saves a lot of time and material from incorrect measurements.

"...No measurements and no taking the sheet off the wall...." Read more

"These are a real time saver. No more wasted material from incorrect measurements...." Read more

"it saves alot of time installing drywall - way less measuring for electrical boxes .." Read more

"...No more measuring and fiddling. Perfect for the weekend reno-warrior like me." Read more

4 customers mention "Time-saving"4 positive0 negative

Customers are satisfied with the pest control device. They mention it's a real time-saver, especially when finishing a cabin.

"These are a real time saver. No more wasted material from incorrect measurements...." Read more

"This little tool will save me a lot of money and time when finishing a cabin. Tried it out a couple of times already. No more wasted paneling...." Read more

"Sweet product! Saved on time and no guessing on where the plugs where! Fantastic" Read more

"Timesaver!..." Read more

4 customers mention "Value for money"4 positive0 negative

Customers are satisfied with the value of the pest control device. They mention it's great.

"This was a show stopper for me. Absolutely love the product. Great value, works awesome." Read more

"...Best $40 I've spent on a drywall tool.." Read more

"This little tool will save me a lot of money and time when finishing a cabin. Tried it out a couple of times already. No more wasted paneling...." Read more

"Great value..." Read more

6 customers mention "Magnetic strength"3 positive3 negative

Customers have mixed opinions about the magnetic strength of the pest control device. Some mention it's super strong, while others say the magnets are really weak.

"...No more wasted material from incorrect measurements. The magnets are very strong as you can see from the picture, they are holding on a desk that is..." Read more

"Really weak magnets. Even when you think you have it in place, its never really over the box. Really mixed results and ended up returning them." Read more

"...The magnetic is super strong so it's easy to find the other side." Read more

"Good idea, but it have to have more powerful magnet. Doesnt work even on 1/4 drywall. It s work, but miss up to 3/4" every time." Read more

Only regret is that I did not find this product years ago!
5 out of 5 stars
Only regret is that I did not find this product years ago!
These are a real time saver. No more wasted material from incorrect measurements. The magnets are very strong as you can see from the picture, they are holding on a desk that is 1" thick so 5'8,1/2 or 3/8 drywall is not a problem. I should also mention they fit various style gang boxes including the pictured plastic boxes and steel boxes. Only regret is that I did not find this product years ago! **update** I have used this product for a few drywall jobs now and the only update to note is when cutting older steel gang boxes, I make the cut about 1/8" inside the lines with an oscillating tool so not to over size the hole. Other then that they work perfect an have been bang on every time.
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Top reviews from Canada

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  • Martin Bergeron
    5.0 out of 5 stars Très bon produit.
    Reviewed in Canada on June 21, 2025
    Verified Purchase
    J'ai pas le compas dans l'oeuil et mes ouvertures dans la plaque au plâtre était plus souvent qu'autrement aproximatives. On rénove notre sous sol et on gagne énormément de temp avec cet outil. c'est incroyablement simple et efficace. Je recommande a tous castor bricolleur. Ceci dit, même si c'est conçu pour des boitier en plastique ça fonctionne aussi avec les boitier en metal.
    Helpful
     Report
  • ANN ONYMOUS
    5.0 out of 5 stars Works as advertised. Sped up my socket cutting significantly.
    Reviewed in Canada on December 8, 2022
    Verified Purchase
    I had to cut sockets in OSB (not drywall), and this tool helped me a lot. No measurements and no taking the sheet off the wall. Depending on the socket type and your cutting tool, you may be hitting that thin wire that inserts into the socket hole. So far it held up but I think in my case the lifetime will be limited. Given the price that might be fine.
    3 people found this helpful
    Helpful
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  • 鶹 Customer
    4.0 out of 5 stars Great tool, big efficiency gains
    Reviewed in Canada on December 27, 2024
    Verified Purchase
    This product works as described. The only issues I've encountered are that I used it incorrectly once (arrows down instead of up) and once I forgot that I had placed a marker behind a sheet of drywall. The only issue that wasn't user error is that he pins that load into the threaded screw holes are very tight in metal boxes. I tried to crimp one with pliers so it would slide in better, but it broke the pin, that marker still works, though. Other than that, this is a worthy tool, easily made my money back in a day through the efficiency gains of not having to measure out electrical boxes.
    Helpful
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  • darcy carruthers
    5.0 out of 5 stars Only regret is that I did not find this product years ago!
    Reviewed in Canada on January 18, 2018
    Verified Purchase
    These are a real time saver. No more wasted material from incorrect measurements. The magnets are very strong as you can see from the picture, they are holding on a desk that is 1" thick so 5'8,1/2 or 3/8 drywall is not a problem. I should also mention they fit various style gang boxes including the pictured plastic boxes and steel boxes. Only regret is that I did not find this product years ago!

    **update** I have used this product for a few drywall jobs now and the only update to note is when cutting older steel gang boxes, I make the cut about 1/8" inside the lines with an oscillating tool so not to over size the hole. Other then that they work perfect an have been bang on every time.
    Customer image
    darcy carruthers
    5.0 out of 5 stars
    Only regret is that I did not find this product years ago!

    Reviewed in Canada on January 18, 2018
    These are a real time saver. No more wasted material from incorrect measurements. The magnets are very strong as you can see from the picture, they are holding on a desk that is 1" thick so 5'8,1/2 or 3/8 drywall is not a problem. I should also mention they fit various style gang boxes including the pictured plastic boxes and steel boxes. Only regret is that I did not find this product years ago!

    **update** I have used this product for a few drywall jobs now and the only update to note is when cutting older steel gang boxes, I make the cut about 1/8" inside the lines with an oscillating tool so not to over size the hole. Other then that they work perfect an have been bang on every time.
    Images in this review
    Customer imageCustomer imageCustomer image
    4 people found this helpful
    Helpful
     Report
  • Mike Kozlov
    3.0 out of 5 stars Do not by it
    Reviewed in Canada on May 29, 2025
    Verified Purchase
    Good idea, but it have to have more powerful magnet. Doesnt work even on 1/4 drywall. It s work, but miss up to 3/4" every time.
    Helpful
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  • Michael
    5.0 out of 5 stars Worked Perfectly on North American Style Outlets!
    Reviewed in Canada on November 22, 2022
    Verified Purchase
    I have done a fair amount of drywalling and one of the biggest headaches was always measuring and pre-cutting the outlet holes only to find you measured incorrectly once the board it in position. This tool saved that headache entirely! I have used it on four outlets so far and it worked perfectly on all four. I would certainly recommend this tool to anyone doing drywalling!
    Helpful
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  • Toronto
    5.0 out of 5 stars Easy to use but
    Reviewed in Canada on October 4, 2021
    Verified Purchase
    Very simple product that does its job.Make sure the finder magnet is right on top of the box magnet,you can wiggle it a bit to feel the strength of the connection.There be probably a few mm play to it but that ok the outlet cover will hide it.When cutting the drywall make sure to cut it a tad on the outer marked outline not on the line itself so you can fit it over the box.
    Helpful
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  • Rim
    4.0 out of 5 stars Almost perfect
    Reviewed in Canada on June 25, 2021
    Verified Purchase
    I used this item for a basement renovation. It's a great product, but there are 2 issues with it that prevent me from giving it full marks. I think another buyer mentioned the first big issue is that the box template seems 1/2 inch bigger along the bottom of the electrical box if you cut out the template. I learned to cut the bottom shorter to get a perfect fit. The second problem is you can't use this item with full outlets. You have to take out the outlet first before using this tool which doesn't make it as useful for jobs that have electrical already completed.
    Helpful
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Top reviews from other countries

  • Matt
    2.0 out of 5 stars Not for Australia / New Zealand
    Reviewed in Australia on August 22, 2020
    Verified Purchase
    These looked great and would be a handy addition if your putting up your own drywall/gyprock in the USA. I got them but they do not fit the AU/NZ size standard size wall plates. I returned them with no issues. Bummer! The magnets seemed pretty strong to me.
    Report
  • Doug
    5.0 out of 5 stars Huge Time Saver
    Reviewed in the United States on July 23, 2025
    Verified Purchase
    This tool is genius! Take care to place it with the arrow pointing up on both pieces and you will have spot-on holes every time.
    Report
  • Max
    5.0 out of 5 stars One of the greatest time savers
    Reviewed in the United States on June 24, 2025
    Verified Purchase
    this tool has saved me so much time and the build quality is very sturdy. You can not believe how much money and time you will save after getting this tool. The value is hard to beat.
    Report
  • Runner
    5.0 out of 5 stars Better than expected - Great for DIYer
    Reviewed in the United States on March 3, 2025
    Verified Purchase
    This review is for homeowners or DIY'ers. I bought this for a home renovation project where I have 38 receptacle boxes to cut drywall around. I took a little extra time with the first couple to ensure accurate alignment and reliability. There is a small amount of play but once I got the hang of the positioning I was happy. The magnets work pretty well on 1/2" (12.7mm) thick lite drywall although I'd suspect it not being great for 5/8" (just a guess). I'm not in a hurry so taking the extra time to position these for a nice fit worked well for me. Yes, it's slower than a Rotozip but I like having a better fit and mudding less. If you only have a few boxes to cut out then it's probably not worth it. I had a variety of receptacle boxes from both Home Depot and Lowes, some thick, thin, deep, shallow, etc. and these fit them all. I even used it on a round light box. To that, I drew the line around the box and then diagonals from the corners to find the center to drill the hole. Would be great if both pieces had a 3/8" hole in the center for drilling light boxes but I know they sell another version for that instead.
    Report
  • taylor
    4.0 out of 5 stars They work fine, strong magnets find each other and align accurately.
    Reviewed in the United States on June 28, 2025
    Verified Purchase
    I bought the set with 3 targets, 1 locator and hard shell plastic case. The plastic storage case is important because the spring wires on the target magnets are vulnerable. The snap on my case is weak but a rubber band works. These things actually work quite well with single and double gang plastic boxes. Works best with single layer sheetrock and the magnet strength will position your cut lines accurate. All my cuts have a tolerance better than 1/8". It will work with double layer 1/2" sheetrock but the magnet grip is weaker which requires more care aligning the cut lines. BUT -- the target magnet requires about 3/4" of open space to fit into the front of the box. Two cables of 12 or14 gauge wire in a single blue box is no problem (6 coiled wires). But if you have crowded boxes, you may have to strip all excess cable sheathing first, or really compress your wires to make room for the magnet. With a properly installed nail-on box, you will set several sheetrock screws around the outer-most edges from the switch box, then trace and cut for the box, then finish the rest of your screws. I rated it 4 out of 5 because I could not use it on a couple two gang boxes that were too crowded but still met NEC fill.
    Report

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