Skip to Main Content »

Search Site
  • Currency: £

Spectra GL422N Extreme Kit

Have a question? Freephone: 08000 869 769
× Our promise to you: Buy from Laser Levels Online, safe in the knowledge that you have paid the best price and that each and every product will have been expertly checked and calibrated by specialists who are able to provide you with free help and support by phone.

Covid-19: We are dispatching orders as usual.

Orders will typically be delivered free by DPD in one working day (England, Wales, Scottish Lowlands) & two working days (Highlands, Northern Ireland & Republic of Ireland) if ordered Mon - Fri by 3:45 pm.


Fully Self Levelling Dual Grade Rotary Laser Level Kit, including HL760 Laser Detector & Radio Remote Control. Also includes Surveying Tripod & Measuring Staff.

Model: GL422N


Was: £1,754.66 Including VAT.

Sale Price: £1,694.66 Incl. VAT: £2,033.59

Rating: 4.65 out of 5 stars

Availability: In Stock In Stock
Order by 3:30pm for Next Working Day Delivery (T&C Apply) *Order by 3:45pm for Next Working Day Delivery.

Calculating time left to place order...

Current Warehouse Stock: 4 available to order today

Product overview:

Spectra GL422N Extreme Laser Level Kit:

Long Range, High Accuracy, Dual Grade Rotational Laser level.


Spectra Precision GL422N is a high performance, TRUE grade laser with two way full function remote control and superior grade, level and vertical plane capabilities. The required grade for each axis is entered via the keypad on the instrument or RC402N remote control, and is displayed on the LCD panel.


The GL422N Grade Laser can also self-plumb in the vertical plane, for applications such as anchor bolt installation and curtain walling.

To avoid interference with any other laser crews on site, or for safety reasons, the laser beam can be electronically blanked out on up to any three sides of the instrument.


The Spectra GL422N can be used with any Spectra Precision laser detector. It is particularly suited for use with the larger machine mounted laser detectors for digging or grading operations, whereby the driver can check the grade without leaving the cab.


The most popular detector choices for the GL422N are the HL760 or CR700 (with magnetic mount) for advanced applications (as described below) or another option is to simply add the standard Spectra CR600 to this kit, when working with plant equipment.

nb. Both the CR600 & CR700 can be used on a conventional staff AND with their magnetic machine mounts, on plant equipment but only the CR700 offers digital offset readings and the following advanced features.


Specialist advanced features:

The Spectra Precision HL760 or CR700 detectors offer both "Automatic Grade Match" and "Vertical PlaneLok" as described below.


Automatic Grade Matching.  A very useful feature for drainage work. You will need both the HL760 or CR700 detector with the RC402N remote control.

The remote control menu is used to access the Auto Grade Matching feature and to signal the laser level to scan up or down (in its Y-axis) to find the detector at its set height. A radio link between the two, enables the laser to be set to the required slope. This is much faster and more accurate than trying to manually set the laser to the required slope.


The PlaneLok function. Using the HL760 or CR700 detector with the RC402N remote control.

This feature is used to lock the laser beam in alignment with the target point - especially useful for general alignment and vertical cladding applications etc.


A unique “Fingerprint” function of the HL760 only accepts the beam from the laser it is paired with.


  • Ideal for grading and excavating
  • Use for long range levelling operations, up to 800m diameter
  • High horizontal levelling accuracy of +/- 1.5mm at 30m
  • Suitable for general construction vertical alignment
  • Set levels for concrete aprons and roadways
  • Manual grading of steep slopes for embankments
  • Five Year Warranty


Fast setup, minimal training time and automatic self-levelling minimize operating costs and boost productivity.
Highly rugged design and unique patent-pending lighthouse seal protects the transmitter head and glass, offering superior drop and weather protection for reduced downtime.
One-person operation reduces labour costs.
High accuracy:  +/-1.5mm at 30 metres, for precise measurements on the job.
Temperature-calibrated, high accuracy for consistent performance across larger jobsites.
IP66 dust and waterproof for continual performance in harsh conditions.
Withstands a direct drop of 1 metre or a 1.5 metres tripod tip-over onto concrete.
Ability to be used up to 800m diameter with a detector, makes the unit ideal for small to large projects.
Single-axis slope mode offers fast set-up and grade match to a reference mark for permanent and accurate ceiling slope reference.
Energy-efficient design offers choice of rechargeable or alkaline batteries for lower operating costs.
Long-range, radio remote control gives you quick access to all the laser functions, without needing to return to the laser instrument.
Customizable to your needs with the choice of two Spectra detectors. 


Laser Source: 650 nm visible, Class 2, red beam
Laser High Accuracy: ±1.5mm @ 30 metres
Operating Range (Diameter) with HL760 detector: 800m
Self-Leveling Range: ±5 degrees
Compensation Method: Electronic self-leveling
Drop Height on Concrete performance: 1m
Grading range: -10% to +15%

(to set over 9% grade, tripod leg adjustment is required)

Grade resolution: 0.001% up to 9.999%
Out of Level (HI) Warning: Yes
Power Source: 10,000mAH high capacity rechargeable battery pack or alkaline batteries
Battery Life: 35 hours (rechargeable)
Rotation Speed: selectable 300 or 600 rpm
Tripod Mount (Horizontal and Vertical): 5/8” x 11
Operating Temperature: -20 to 50°C
Storage Temperature: -20 to +70°C
Water Resistant: Yes, to IP66 protection level
Size: 21 x 18 x 20cm
Weight: 3.1 kg
Warranty: Full 5 years parts & labour

Detector features:

Choosing the right detector ensures maximum performance from the GL422N. The kit has an HL760 or CR700 for machine control applications but also see the optional magnetic detector, model CR600. It is more basic than the CR700 but competitively priced.


Standard kit with HL760 Detector & Bracket:

The Spectra Precision® Laser HL760 Laser Detector, a highly versatile laser receiver for basic and advanced leveling and aligning applications, is designed for general, concrete and site preparation contractors.

The HL760 is an easy-to-use tool that accurately measures elevations across the site, and is ideal for use with any rotating red beam laser levels.

It features a digital readout of elevation that provides a numeric display of +/-50mm to 0.5mm resolution. The readout is displayed on the large front and rear LCD's and shows exactly how far the elevation is from on-grade. Accurate measurements can be made without moving the rod clamp, saving time and increasing productivity.

Selectable units of measurement can be displayed to meet your specific application - mm, cm, ft, in or fractional inches.

A 127mm long pick-up window, more than double the industry standard, allows quick acquisition of the laser beam.

An anti-strobe sensor prevents false readings from any adjacent site strobe lights.


Radio Communication - allows working with another HL760 for long range remote display and monitoring capability. The HL760 also communicates with an LL400HV, HV302, GL412N and GL422N in automatic Grade Match and PlaneLok applications.


"Fingerprinting" - this is a NEW function which links the HL760 with a particular Spectra Laser. Once it is paired with the laser level, the detector has the ability to filter out all other lasers that strike its pick-up window and ONLY accept the laser that it is paired with.

A very useful feature on busy worksites.


This detector is designed to survive tough construction site conditions; it is totally waterproof (IP67) and can withstand a drop of 3 metres (10 feet) onto concrete.

The HL760 comes with a 3-year "No Excuses" warranty. It can be used as either a hand-held or staff mounted detector for a wide range of applications.



Fingerprint function filters out other lasers.

Reduces rework by allowing remote monitoring. 

Increases reliability, accuracy and durability.

No need to go "on-grade" to measure: saves considerable setting-out time.

Digital readout of elevation - not only will high or low arrows be displayed, but the exact distance from grade will be numerically displayed, which eliminates the need to get "on-grade" to make measurements.

Large 127mm reception height acquires the beam quickly and makes it easy to stay in the beam. Anti-strobe sensor stops construction strobe lights from setting off the detector and makes it easier to identify true laser beam signals.

Simultaneous elevation LED's signal in low light levels and over a longer range for easier reading in poor light conditions.

A new CAPTURE function remotely captures and retains a measurement, when the display is difficult to see.

Multiple deadband sensitivity settings, five in all, allows adaptation to meet all your jobsite requirements.

Dust and weatherproof housing withstands a drop of up to 3 m (10 ft) onto concrete for reduced downtime.

Two clamp positions for cut/fill or excavation. Excavation mode puts more reception height and elevation information above grade for higher utilization in digging and staking applications.

Example usage:

Remote grade checking with cable free Remote Display.

Wireless monitoring of foundations and steel erections.

Risk free monitoring of tilt up wall position.

Setting and checking jobsite elevation and depth for:
Cut and fills
General grading
Foundations, forms and footings

Product video:

Please note: The Kit contents differs slightly from the video. Please see our "Kit comprises of" info below, for full details as some products are optional upgrades.

Please note: The Kit contents differs slightly from the video. Please see our "Kit comprises of" info below, for full details as some products are optional upgrades.

Technical specification:

+/- 1.5mm @ 30 metres, max. operating diameter 800m (400m either side of the instrument).
An accuracy of +/- 1.5mm @ 30 metres is equivalent to 0.05 mm/m and to put that into perspective, the best premium German spirit level has an accuracy of +/- 0.5 mm/m or +/- 15mm @ 30 metres.

Example usage:

Slopes on grade
Levelling forms and footers
Screeding concrete
Driveways and ramps
Machine control
Cut & Fill 

If you need?:

Spectra 5 Year - No Cost - WARRANTY

This laser is covered by a 5-Year Warranty which covers all defects due to material and workmanship. Spectra Precision Laser products with this warranty that have failed will be repaired FREE OF CHARGE for five years from the date of purchase.

Also included in the kit:

The Spectra Precision GL422N Kit also includes the following:


Telescopic Levelling Staff (Model: TLS4S)

(Colours / Brand may vary)

4m, 5-section, Telescopic Levelling Staff. 
Five robust aluminium sections with abrasion proof scale.
Closed length height 970mm, extending to maximum height of 4m.
Automatic locking buttons when extended.
Millimetre scale on back and E-graduations (1cm) markings on front
Rear mm scale (for use with laser levels) has ZERO mm marking at ground level.
Red / Black coded front sections.
Accepts all Laser detector mounting brackets.
Removable, rear mounted circular Bubble Level.
Carry sleeve.
Height: 0.97m closed length to extended max 4m. 
Weight 1.15kg.


Surveying Tripod (Model: S-LAT)

(Colours / Brand may vary and may have branding on tripod leg)

Maximum 1.5m height. 
Robust aluminium tripod. 
Extending legs with quick-release, toggle clamp adjustment. 
Flat top, mounting head. 
Head size 130mm
5/8 inch x 11 thread. 
Closed length 0.925m
Max. Opened height 1.5m approx.
Weight: 3.4kg
Carry strap

Purchase options:

Need to mount a Detector on Plant equipment?


The GL422N can be used for machine control with either the CR600 or CR700 Detectors which can be purchased as a optional extra or upgraded as part of the kit.

For further details of the Spectra CR600 please Click Here.

For further details of the Spectra CR700 please Click Here.

Calibration and servicing:

We check and calibrate all Lasers prior to dispatch, to ensure they meet or exceed the manufacturers published specifications at the time of shipment from the factory.
If you routinely work on large job sites, which require you to have a physical Calibration certificate, issued in your name and matched to the Laser via its serial number, you must ensure you tick the above box marked "Paper Certificate" (where applicable) to add a Calibration certificate to your order. The Certificate will then be generated and included with your Laser. Please note the issuing of a Calibration certificate DOES NOT delay or hold up the despatch of your Laser in any way.

Kit comprises of:

Spectra GL422N Rotary Grade Laser Level (checked and pre-calibrated)

Spectra HL760 Laser Detector with mounting bracket & batteries (Option to upgrade to either CR600 or CR700 Magnetic Laser Detector)

Spectra RC402N Radio Remote control & batteries

Rechargeable Battery pack (high capacity) & Mains Charger

Robust carry case

Instructions / Safety Manual

5 years Warranty

Surveying Tripod

4m Measuring Staff

Delivery prices for commonly delivered to places:

Delivery to UK (including Northern Ireland, Scottish Highlands & Islands) - FREE Delivery for all customers in the United Kingdom

Delivery to Republic of Ireland - DPD Local - 2 Working Days - FREE Delivery for all customers in the Republic of Ireland

Delivery to Jersey / Guernsey / Alderney / Sark / Isle of Man - DPD Local - 2 Working Days: £15.99.

Delivery to Sweden, Norway, Finland, Denmark, Iceland, Holland, Belgium - Courier Service (3-6 Working Days): £24.99 GBP.

Delivery to all other locations - full details available at checkout.

VAT Invoice:

When the order is dispatched, a PDF (digital copy) of the VAT invoice will be attached to the dispatch confirmation email and a paper copy of the VAT invoice will be in the box.

Key information:

Model GL422N
Brand Spectra Precision
Type Rotary Laser
Laser beam Dot
Laser colour Red Beam
Beam axis Horizontal & Vertical
Levelling Fully Self Levelling
Usage Outdoor
Facilities Scan
Slope setting Dual grade
Setting out Squaring / 90° Setting Out
Mounting thread 5/8 inch
Power source Rechargeable
Laser output Class 2
IP rating IP66 (Dust tight / Protected against powerful jets of water)
Warranty Automatic 5 Year Warranty

Frequently bought together:

Customers who bought this product also commonly purchased the following combination of items.

This Item: Spectra GL422N Extreme Kit

Spectra CR600 Magnetic Detector

Was: £339.00

Sale Price: £274.00 Incl. VAT: £328.80

As low as: £312.36

Price for all: £1968.66 Excl. VAT.

You may also be interested in the following similar products:

Spectra GL622N Extreme Kit

Spectra GL622N Extreme Kit

£2,099.00 Incl. VAT: £2,518.80
Spectra LL300S Premium Kit

Spectra LL300S Premium Kit

Was: £659.99

Sale Price: £633.59 Incl. VAT: £760.31

As low as: £699.48

Questions and answers about this product:

Please click the relevant question to display the answer. Or you can ask your own question by clicking the "Ask a Question" button.

Common Questions: Can you ship to my country and how much does it cost?
Answer: Yes, we deliver worldwide. Simply add your products to the basket and at the checkout enter your details and it will then calculate the cost of delivery and show you a full total.
Common Questions: I am outside the UK and have an EU V.A.T, C.B.L, T.V.A, MOMS, I.V.A, BTW or USt number - How do I remove UK VAT?
Answer: You can enter your V.A.T, C.B.L, T.V.A, MOMS, I.V.A, BTW or USt number at the checkout and if it is valid, UK V.A.T will then be removed and set to 0%.
Common Questions: Is the product in stock?
Answer: Yes, if it says 'In Stock' then it's in Stock.

Posted by Michael Duffy on Thursday 11th of June 2020


Hello I have the Spectra GL422N and a code Error 001-000-021 is coming up was wondering if you could help me thanks. Regards Michael


  • Posted by Laser Levels Online - Support on Thursday 11th of June 2020


    Error code 001-000-021 on the GL422N is a temporary EEprom problem.

    Solution: Press the E button to delete this error message.

  • Posted by Laser Levels Online - Support on Thursday 11th of June 2020

    Hello Michael

    Thanks for your enquiry about your Spectra GL422N.

    We are having difficulty in finding your order on our system under your name or email address.

    Please provide more details or did you not purchase from us?

    Best regards


    Laser Levels Online

Ask Your Question

* Required Fields

This product has been recommended as being suitable for the following trades or applications:

Use spaces to separate recommendations. Use single quotes (') for phrases.

Quickly see a direct comparison of mid-range rotary lasers (on the left), with the equivalent alternative premium brand rotary lasers (on the right).