A radio link between the laser and the receiver that locks the laser beam to a fixed elevation or direction. The laser actively maintains beam position on the receiver — improving accuracy, eliminating drift caused by vibration or temperature changes, and making it ideal for applications like concrete pads that demand tight tolerances.

Allows you to match the fall of the ground or match between two existing elevations without complex calculations.

• Manual Grade Matching: After measuring laser height, take the receiver to the target elevation and slope the laser until the beam hits the on-grade position on the receiver.
• Automatic Grade Matching: The laser and receiver communicate via radio and the beam is automatically driven to the on-grade position. Some models also display the actual grade value.

Spectra Precision’s HL-prefix receivers feature a patented design that delivers consistent accuracy across the entire operating range. Instead of manually positioning the receiver on-grade, the digital display shows exactly how far from on-grade you are — allowing faster, more accurate work.

Readouts switch between metric and English units. When paired with compatible lasers, these receivers enable PlaneLok, Automatic Grade Matching, and Axis Alignment.

When working with grade, even a slight mis-alignment can cause significant errors over distance. Automatic Axis Alignment lets the laser communicate with the receiver placed on the grade hub and self-align automatically — within a ±40° range — eliminating manual setup error and speeding up configuration.

Introduced with the HL760 receiver, Fingerprinting lets you pair a receiver with a specific laser. Once paired, the receiver filters out all other laser signals — including other brands — and responds only to its assigned laser. When unpaired, the receiver can detect all red-beam laser brands. All lasers marked with the Fingerprint icon support this feature when used with the HL760.

Spectra Precision lasers marked with the Shockproof icon are built to survive real job site abuse:

• 3-foot drop onto concrete
• 5-foot tripod tip-over protected

While calibration cannot always be guaranteed after a drop, the most expensive internal components remain protected — significantly reducing lifetime running costs.

Several Spectra Precision lasers are self-leveling in the vertical axis, making them ideal for:

• Formwork and foundations
• 90° reference lines
• Fencing, facades, and wall layout

HV-Series, GL400-Series, GL600-Series, and UL-Series models all support vertical use. The PlaneLok function works in both horizontal and vertical positions. Laser clamps and receiver brackets are available for quick vertical setup.