Product Description

803-CL Length Reference Kit

Configurable length reference bar for laser trackers (English units)

Our 803-CL Kit provides a reference length for use during laser tracker or scanner jobs. Use it to establish system scale when using single measuring instruments or when bundling multiple instruments together. Or use it to verify system accuracy and stability during a measurement job. Many of our customers shoot a length reference bar at the beginning, middle, and end of a job to gain confidence that nothing moved or changed during the shoot.
The 803-CL consists of a kit of our Invar tubing and connectors, two of our 1.5INV magnetic SMR nests (for a 1.5″ SMR), and four 15199 square support feet. SMRs are not included with this kit. The Invar tubing elements are individually NIST-traceable. Invar is an excellent material for this application due to its extreme stability over a wide temperature range.
Invar Tubes 12587 Series
Tube Length Tolerance ±0.0001″
Total Stack-up Error ±0.0005″

803-CL Invar Kit Components

Legend Part Number Description Qty
A 12587-20IN 20″ Invar Tube 4
12587-10IN 10″ Invar Tube 2
12587-5IN 5″ Invar Tube 2
B 1.5INV-1 SMR Holder 2
C 15199 Clamp-On Foot 4
D 12406-G1 Stainless Steel Invar System Connectors 10
no photo 12421-G1 Plastic Case 1
no photo NIST Traceable Certification for Kit 1

May Be Used With

Any 1.5″ SMR


Approx. weight:
Kit and case, 17 lbs. (7.7 kg)
Shipping, 22 lbs. (10 kg)
Thermal expansion coefficient:
0.68 x 10−6 in./in.°F for temperature range of 0-200°F (1.26×10−6 m/m/°C for temperature range of −18°C to 93°C)
Invar tubing: 1″ (25.4 mm) diameter Invar with stainless steel end caps, having 3/8″-24 internal threads on each end
Finish: Oil and stain resistant PVC jacket, red
Case: Plastic case with foam insert