Description
The Seco -30/0 mm Premier Prism Assembly (6 x 9 inch target) is a survey prism made by Seco (part number 6402-06-FLB / 6402-06-FOB / 6402-06-YLB).
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: | 6402-06 |
| Manufacturer: | Seco |
| MPN: | 6402-06-FLB / 6402-06-FOB / 6402-06-YLB |
| Status: | Current |
| Height Offset: | 100.0 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: | 800 g |
| Mount: | 5/8" Thread |
| Coating: | copper |
| Housing: | heavy-duty canister; anodised aluminium tilting holder |
| Equivalents: | Marketed for Nikon, Topcon and Sokkia total stations |
| Last verified: | 21/10/2026 |
Sources
Seco -30/0 mm Premier Prism Assembly (6 x 9 inch target) FAQ
Below is a list of frequently asked questions about Seco -30/0 mm Premier Prism Assembly (6 x 9 inch target).
What is the prism constant for the Seco -30/0 mm Premier Prism Assembly (6 x 9 inch target)?
The Seco -30/0 mm Premier Prism Assembly (6 x 9 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 -30/0 mm Premier Prism Assembly (6 x 9 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 -30/0 mm Premier Prism Assembly (6 x 9 inch target)?
The height offset is 100.0mm.
