Bosch · GLL100-42GL
Ready to buy
The retained reference is $289 current U.S. retail price. Tripod, grade rod, receiver and calibration service are separate; temporary card offers and tax are excluded. Verify line geometry, range conditions, mounts, included accessories, laser class, inspection procedure, authorized seller, warranty and return rights before purchase.
Current market
Each line carries its own check date because price, software, specifications, and product cycle do not age at the same speed.
Tripod, grade rod, receiver and calibration service are separate; temporary card offers and tax are excluded. Confirm current stock, exact kit contents, authorized U.S. seller, tax, shipping, return rights and service eligibility before paying.
GLL100-42GL is the defended simple interior choice when two bright lines and dual power are sufficient and receiver or slope work is not required.
Other paths
These are not generic competitors. Each one represents a different way to buy into the same market.
Bosch
DEWALT
What changed
Older observations stay in the ledger when the current view changes. That lets a buyer tell the difference between an old complaint, an active issue, and a problem that was corrected.
GLL100-42GL was checked against exact identity, current U.S. price, geometry, laser class, range conditions, accuracy basis, leveling and slope, mount and detector compatibility, power, durability, calibration, service, safety and outcome boundaries, independent professional evidence and bounded operator reports.
Each amount stays tied to its source and capture date. Conflicting prices remain visible until the seller resolves them.
Current reference priceA structured timeline will begin with the next source capture
Owner experience
Owner and operator discussion returns to line visibility, usb-c power, bracket stability, lack of receiver mode and post-impact checks rather than a universal accuracy, durability or productivity result.
These are self-selected reports from different units, distances, light, surfaces, weather, mounts, receivers, rods, batteries, drops, calibration histories, crews, sellers and service channels. They identify setup and inspection questions and do not establish accuracy, calibration retention, reliability, safety, failure rates, grade, level, plumb, square, productivity or finished-work outcomes.Self-selected operators discuss visibility, mounting, detector use, calibration checks, drops, batteries and service. Reports vary by distance, light, surface, setup and tool history and do not establish accuracy or reliability rates.
Verify that two lines cover the task, test the bracket on the actual substrate and record a wall check before layout.
1 evidence recordSources
The page separates what a source states directly from what we conclude across sources.
Bosch identifies GLL100-42GL as a compact current Bosch horizontal and vertical green cross-line system with rechargeable 3.7 V and alkaline power paths.
$289 current U.S. retail price was retained for GLL100-42GL. Tripod, grade rod, receiver and calibration service are separate; temporary card offers and tax are excluded
Class 2 green laser with one horizontal and one vertical line, selectable as a cross; steady lines cover interior level and plumb work but do not surround the room 100-foot stated visible working range under suitable conditions; this exact model has no receiver compatibility, so brightness, surface, ambient light and line width set the practical boundary Published leveling accuracy is ±1/8 inch at 30 feet. Perform the manual wall reversal and vertical checks before critical layout and after a drop, temperature shock or transport; the rating is not a per-job calibration certificate Pendulum self-levels within ±4 degrees, flashes out of level and locks for transport. Bosch says this model does not provide an energized manual slope mode
Included magnetic L-bracket and 1/4-20 thread support interior placement; no detector is supported, and a magnetic hold must be checked against the actual steel surface Included 3.7 V 3.0 Ah pack or AA adapter, about eight hours stated on Li-ion, USB-C charging while operating and IP65 housing; ingress rating does not cover immersion, battery damage or an unsecured fall One-year measuring-tool warranty can extend one year after timely registration. Lock the pendulum, check accuracy after impact and use Bosch service rather than opening the optics. Do not stare into or aim the beam, and place it above or below eye level where practical
FDA explains that Class 2 visible lasers depend on the aversion response and that Class 3R direct viewing can be hazardous. Product class does not make deliberate viewing or aiming at people acceptable.
OSHA construction rules require qualified operators, warning placards, shutter or power-off when unused, no direction at employees and positioning above head level where possible.
Professional comparison evaluates point, cross-line and three-plane tools by geometry, visible and receiver range, accuracy basis, power, mounts and job fit. It is decision context rather than manufacturer proof for every exact SKU.
Self-selected operators discuss visibility, mounting, detector use, calibration checks, drops, batteries and service. Reports vary by distance, light, surface, setup and tool history and do not establish accuracy or reliability rates.
GCL165-42GL is the cross-line plus plumb-point transfer defended alternative at $349 current U.S. retail price.
Green Cross Line Laser is the simple aa cross-line layout defended alternative at $229 current U.S. retail price.
Manufacturer identity, exact manual or support documentation, current U.S. price, independent professional decision evidence and bounded owner or operator evidence were checked on August 19, 2026. This desk covers complete current U.S.-supported point, line, plane and rotary laser layout systems used by trades and serious construction buyers. A detector, receiver or remote is part of the counted system only when bundled with the exact kit or intrinsic to its working method; otherwise it remains a separately priced compatibility boundary. The desk excludes bubble levels, laser distance meters, surveying total stations, unsupported marketplace devices, bare accessories, cosmetic bundles, minor color or battery-pack padding and duplicate tool-body or kit variants without a material system difference. Laser class, color and visual brightness do not establish useful range, accuracy or eye safety. Visible range and detector-assisted radius or diameter are separate claims that vary with light, weather, target, rotation speed and setup. Published accuracy belongs to a named geometry, distance, axis and condition and is not a calibration certificate. Points, lines, plane intersections, plumb, square, rotary axes, mounts, receiver zeros and rods can require separate checks. Self-leveling compensation, manual lock, fine rotation, automatic alignment and single- or dual-axis slope are different functions. Manual or receiver-guided slope does not import a design grade or establish survey control. Tripod stability, magnetic hold, clamp reference, thread compatibility, benchmark protection, battery state, ingress and post-impact checks remain operator duties. IP and drop claims do not guarantee retained calibration or cover open battery doors, all accessories, immersion or continued use after a fall. Follow the exact manual, FDA labeling and applicable OSHA construction-laser practice. Use qualified operators, warning controls, beam shutters or power-off when idle, and keep direct and reflected beams away from people and vehicles. Visibility glasses are not protective eyewear. Use manufacturer repair or calibration service when a field check fails and do not open the optical system. No construction laser guarantees code compliance, survey-grade control, grade, plumb, square, level, finished appearance, rework avoidance, productivity, safety or any job outcome.
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