Head-to-head · Best Stud Finders

Craftsman CMHT77633 vs Zircon StudSensor A100

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

Verdict is reader-supported. As an Amazon Associate we earn from qualifying purchases. Some links on this page are affiliate links — if you click through and buy, we may earn a small commission at no extra cost to you. Our ratings are sourced from independent publications, not sponsors.

The short answer

Zircon StudSensor A100 comes out ahead by a clear margin (4.3 vs 5.0). The gap is mostly about Homeowners hanging shelves and televisions on ordinary drywall. — read the strengths below before deciding.

Ranked #3 in Best Stud Finders

Craftsman CMHT77633

4.3

2 sourcesall derived$13.99as of Aug 1

The CRAFTSMAN CMHT77633 3/4-in Depth Stud Finder locates wood and metal studs through drywall, wallpaper, and fabric-covered walls. Reviewers pointed to the shock-resistant, water-resistant housing and built-in AC detection as durability strengths. Reliability is the sticking point: users report calibration failures and performance that drifts after the first few uses. A limited lifetime warranty covers some of that risk, though plenty of reviewers still called the tool a letdown. Buy it if you need basic stud detection and can live with the odds of getting an unreliable unit.

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

$13.99 · Check Price on Amazon Full review →

Higher ratedRanked #1 in Best Stud Finders

Zircon StudSensor A100

5.0

1 sourceall derived$26.32as of Jul 31

The StudSensor A100 is an edge finder, not a center finder: it marks where a stud begins and ends and leaves the midpoint to be worked out by hand. StudScan reads to ¾ in. (19 mm) and DeepScan doubles that to 1½ in. (38 mm), while WireWarning flags live unshielded AC wiring in either mode. A 9V alkaline battery is required and not included.

Strengths

— StudScan mode locates edges of wood and metal studs up to 3⁄4 in. (19 mm) deep
— DeepScan Mode doubles scanning depth to locate edges up to 11⁄2 in. (38 mm) deep
— WireWarning Detection indicates presence of live unshielded AC electrical wiring up to 2 in. (50 mm) deep

Watch-outs

— Marks stud edges only, so finding a center means marking both sides and measuring
— Not recommended for lath and plaster walls
— Requires a 9V alkaline battery that is not supplied

$26.32 · Check Price on Amazon Full review →

Derived means the reviewer published no score, so one was inferred from their written verdict. Everything else is a number the publisher printed. How we rank.

How they stack up

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.

Zircon StudSensor A100

The Franklin Sensors ProSensor M210 lights up a whole stud at once and needs no calibration pass, which is the real upgrade over an edge finder. The battery-free C.H. Hanson 03040 is a magnet, cheaper and dumber. The A100's case for itself is scanning depth plus the wire warning at around $26.32.

Specs side-by-side

Spec	Craftsman CMHT77633	Zircon StudSensor A100
Detection Depth	¾-in	Up to ¾ in. (19 mm)
Weight	0.233 lbs	4.80 oz. (136 g) without battery
Material	Plastic	Plastic
Battery Type	9V	9V alkaline required (not included)
Features	—	21
Sensors	—	13

← See the full ranking of best stud finders