Description
The Seco 62 mm Premier Prism Assembly with 5.5 x 7 inch Target is a survey prism made by Seco (part number 6422-02-YLB / 6422-02-FOB).
It can be set up in two positions, giving an absolute prism constant of 0.0 mm or -30.0 mm (+34.4 mm or +4.4 mm on the Leica scale). Always check which position is in use before measuring.
Specifications
| Model: | 6422-02 |
| Manufacturer: | Seco |
| MPN: | 6422-02-YLB / 6422-02-FOB |
| Status: | Current |
| Height Offset: | 115.0 mm |
| Absolute constant: | +0.00 mm or -30.00 mm |
| Leica constant: | +34.40 mm or +4.40 mm |
| Two mounting positions. Check which one is in use before measuring. | |
| Constant source: | Manufacturer documentation |
| Prism diameter: | 62 mm |
| Weight: | 720 g |
| Mount: | Waterproof M20 universal mounting thread |
| Coating: | copper (per product page) |
| Housing: | anodised aluminium tilting holder; 18-gauge steel target |
| Last verified: | 21/10/2026 |
Sources
Seco 62 mm Premier Prism Assembly with 5.5 x 7 inch Target FAQ
Below is a list of frequently asked questions about Seco 62 mm Premier Prism Assembly with 5.5 x 7 inch Target.
What is the prism constant for the Seco 62 mm Premier Prism Assembly with 5.5 x 7 inch Target?
The Seco 62 mm Premier Prism Assembly with 5.5 x 7 inch Target has two mounting positions. The absolute prism constant is 0.0mm or -30.0mm. The Leica constant is 34.4mm or 4.4mm.
Can I use the Seco 62 mm Premier Prism Assembly with 5.5 x 7 inch Target with a Leica instrument?
Yes, just set the prism constant to 34.4mm (or 4.4mm in the second position).
What is the height offset of the Seco 62 mm Premier Prism Assembly with 5.5 x 7 inch Target?
The height offset is 115.0mm.
