Description
The Trimble GNSS/Prism Mounting Assembly is a monitoring prism made by Trimble (part number 58008040).
Its absolute prism constant is -40.0 mm, which is -5.6 mm on the Leica scale.
Specifications
| Model: | Monitoring Prism with GNSS mount |
| Manufacturer: | Trimble |
| MPN: | 58008040 |
| Status: | Current |
| Height Offset: | 80.0 mm |
| Absolute constant: | -40.00 mm |
| Leica constant: | -5.60 mm |
| Constant source: | Manufacturer documentation |
| Prism diameter: | 62 mm |
| Weight: | 900 g |
| Range: | 5000 (5500 with DR Plus), standard clear atmosphere |
| Mount: | 5/8" Thread |
| Coating: | Silver |
| Last verified: | 21/10/2026 |
Sources
Trimble GNSS/Prism Mounting Assembly FAQ
Below is a list of frequently asked questions about Trimble GNSS/Prism Mounting Assembly.
What is the prism constant for the Trimble GNSS/Prism Mounting Assembly?
The absolute prism constant for the Trimble GNSS/Prism Mounting Assembly is -40.0mm. The Leica constant is -5.6mm.
Can I use the Trimble GNSS/Prism Mounting Assembly with a Leica instrument?
Yes, just set the prism constant to -5.6mm.
What is the height offset of the Trimble GNSS/Prism Mounting Assembly?
The height offset is 80.0mm.
