Model: GMP104.
Overview
The GMP104 L-Bar Optical Len Prism Die-Cast Aluminum Monitoring Mini Prism for Total Station is supplied as an optical prism. Optical / electrical data: sheet resistance Weather-Resistant for Permanent Outdoor Installati. Surface quality Smooth Matte Black Powder Coating. Dimensions, material grade, coating and finish can be quoted to your drawing; the values above are the listed starting point.
Specifications
| Surface Quality | Smooth Matte Black Powder Coating |
|---|---|
| Appearance And Structure | L-Bar |
| Function of Measurement | Classical Total Station |
| Model NO. | GMP104 |
| Accuracy Options | Available in 3-4", 5-8", and 10" Arc Seconds |
| Body Material | High-Grade Die-Cast Aluminum Alloy |
| Manufacturing Process | Industrial Die-Casting for Enhanced Structural Sta |
| Prism Type | L-Bar Mini Prism / Right Angle Prism |
| Prism Diameter | 25.4 mm (1 Inch) |
| Prism Coating | High-Reflectivity Copper Coating (Copper-Coated) |
| Absolute Offset | -25.5 mm (Standard Constant) |
| Swiss Offset | +8.92 mm |
| Waterproof Feature | Non-Waterproof Groove Design (Standard Die-Cast Ve |
| Mounting Interface | L-Bracket with Pre-Drilled Mounting Hole for M8 or |
| Measuring Range | up to 2000m Depending on Atmospheric Conditions |
| Constant Compatibility | Fully Compatible with Major Brand Total Stations |
| Environmental Resistance | Weather-Resistant for Permanent Outdoor Installati |
| Reflective Performance | High-Precision Optical Glass with Low Light Loss |
| Supplier | Mount Laser (Changzhou) Instrument Co., Ltd. |
Technical data
| Model | GMP104 |
|---|---|
| Product Name | Standard Quality Die-Cast Aluminum L-Bar Prism |
| Body Material | High-quality Die-cast Aluminum |
| Prism Diameter | 25.4 mm (Copper-coated) |
| Accuracy | Available in 3-4", 5-8", and 10" arc seconds |
| Absolute Offset | -25.5 mm |
| Swiss Offset | +8.92 mm |
| Features | Robust structure for harsh environments; stable performance |
| Applications | Geotechnical monitoring, construction site surveying |
What to specify when you request a quote
- Material — listed as “High-Grade Die-Cast Aluminum Alloy”; name the glass or crystal.
- Geometry — listed as “25.4 mm (1 Inch)”; give diameter, focal length or radii, angles and tolerances.
- Surface figure — listed as “Smooth Matte Black Powder Coating”; quote surface figure (λ) and scratch-dig.
- Centring and edges — state centration and edge chamfer.
- Coating — listed as “High-Reflectivity Copper Coating (Copper-Coated)”; list the band and reflectance or transmission target.
Engineering guides for this part
How parts like this are machined and finished is covered in Flat Glass Polishing Process for Precision Substrates. Before sending a drawing, check Design Guide for Holes, Slots, and Edges in Custom Glass Parts.


