Description
The Seco -35 mm Premier Prism Assembly (6 x 9 inch target) is a survey prism made by Seco (part number 6402-05-FLB / 6402-05-FOB / 6402-05-YLB).
Its absolute prism constant is -35.0 mm, which is -0.6 mm on the Leica scale.
Specifications
| Model: | 6402-05 |
| Manufacturer: | Seco |
| MPN: | 6402-05-FLB / 6402-05-FOB / 6402-05-YLB |
| Status: | Current |
| Height Offset: | 135.0 mm |
| Absolute constant: | -35.00 mm |
| Leica constant: | -0.60 mm |
| Constant source: | Manufacturer documentation |
| Prism diameter: | 62 mm |
| Weight: | 800 g |
| Mount: | 5/8" Thread |
| Coating: | silver |
| Housing: | heavy-duty canister; anodised aluminium tilting holder |
| Equivalents: | Marketed for Precisional and Spectra Geospatial total stations |
| Last verified: | 21/10/2026 |
Sources
Seco -35 mm Premier Prism Assembly (6 x 9 inch target) FAQ
Below is a list of frequently asked questions about Seco -35 mm Premier Prism Assembly (6 x 9 inch target).
What is the prism constant for the Seco -35 mm Premier Prism Assembly (6 x 9 inch target)?
The absolute prism constant for the Seco -35 mm Premier Prism Assembly (6 x 9 inch target) is -35.0mm. The Leica constant is -0.6mm.
Can I use the Seco -35 mm Premier Prism Assembly (6 x 9 inch target) with a Leica instrument?
Yes, just set the prism constant to -0.6mm.
What is the height offset of the Seco -35 mm Premier Prism Assembly (6 x 9 inch target)?
The height offset is 135.0mm.
