Head-to-head · Best Stud Finders

Bosch GMS120-27 vs Craftsman CMHT77633

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

The short answer

Bosch GMS120-27 comes out ahead by a clear margin (4.3 vs 3.4). The gap is mostly about Users needing multi-material detection — read the strengths below before deciding.

Higher ratedRanked #2 in Best Stud Finders

Bosch GMS120-27

4.3

$98as of Jul 6

The Bosch GMS120 Wall Scanner is a multi-detection device that finds wood studs, metal objects, rebar, copper, and live wiring. Reviewers noted its accuracy in detecting copper pipe and live wiring, with one reviewer calling it 'one of the most accurate scanners around, for its size and price.' The unit performs well in drywall and plaster environments but had difficulty detecting live wires in conduit. One reviewer found the display hard to read when the backlight was on, and another noted it was tough to pinpoint exact locations. It's recommended for users needing more than basic stud detection, though those focusing primarily on live wiring may want alternatives.

Strengths

— Detects multiple material types including wood studs, metal objects, rebar, copper, and live wiring
— Features large, easy-to-read display with visual, audible, and tactile alerts
— Accurate detection of copper pipe and live wiring in testing scenarios

Watch-outs

— Display visibility issues with backlight enabled
— Difficult to detect live electrical wires in conduit

$98 · Check Price on Amazon Full review →

Ranked #5 in Best Stud Finders

Craftsman CMHT77633

3.4

$9.59as of Jul 6

The CRAFTSMAN CMHT77633 3/4-in Depth Stud Finder is designed for detecting both wood and metal studs through drywall and surfaces covered in wallpaper or fabric. Reviewers noted its durability with a shock-resistant, water-resistant body and integrated AC detection. However, user feedback highlights significant reliability issues, with multiple reports of calibration failures and inconsistent performance after initial use. The product's limited lifetime warranty offers some protection, but many reviewers expressed disappointment with its functionality. This tool is best suited for users who need basic stud detection and can tolerate potential reliability concerns.

Strengths

— Works on wallpaper and fabric with depth range of ¾-in through drywall
— Locates stud edges of both wood and metal studs
— Shock-resistant and water-resistant body for durability

Watch-outs

— Frequent calibration issues reported by users
— Inconsistent sensing performance after initial use

$9.59 · Check Price on Amazon Full review →

How they stack up

Bosch GMS120-27

The Bosch GMS120-27 excels in multi-material detection, including copper pipes and live wiring, which the Franklin Sensors ProSensor M210 and Klein Tools ESF150LL don't emphasize. While the Zircon StudSensor A100 and C.H. Hanson 03040 offer edge detection and magnetic alternatives respectively, the Bosch scanner provides the most versatile detection capabilities for complex wall environments. However, its display visibility issues and difficulty detecting live wires in conduit make it less ideal than the ProSensor M210 for deep or precise detection tasks.

Craftsman CMHT77633

The Craftsman CMHT77633 offers shock and water resistance, which the C.H. Hanson 03040 and Klein Tools ESF150LL lack, but its frequent calibration issues and inconsistent performance make it inferior to the more reliable Zircon StudSensor A100 and Bosch GMS120-27. While it works on wallpaper and fabric, its reliability problems prevent it from matching the accuracy of the Franklin Sensors ProSensor M210.

Specs side-by-side

Spec	Bosch GMS120-27	Craftsman CMHT77633
Detection Depth	Up to 2	¾-in
Battery Type	9V	9V
Sensors	pair of sensors	stud sensor
Weight	0.6 lbs	0.233 lbs
Material	Plastic	Plastic
Features	—	3/4-in Depth

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