Require comprehensive surveying equipment for asphalt road construction project. Detailed specifications:
1. GPS/GNSS RTK 2 system 440 channels (1 base + 2 rovers) with internal/external radios and data processing software
2. Total station (1" angular accuracy) with USB flash recording capacity
3. Automatic Levels (NA 2/NAK2 equivalent)
4. Leica digital level sprinter 250M
5. Heavy duty tripods & light duty leveling tripods
6. Metal leveling staves (5m), ranging rods (2.5m), fiber-glass tapes 50m
7. Prism reflectors (single & triple), handheld GPS units
8. Spare batteries and rapid chargers for RTK/Total Station
9. Walkie talkie pairs and bar-coded digital level staves
All equipment must include standard accessories. Delivery required to Dar es Salaam, Tanzania. Price competitiveness prioritized.

We require 4.5 Hz horizontal and vertical seismic geophone elements for 3C seismic survey equipment.  
Key specifications required:  
- Natural frequency: 4.5 Hz  
- Dual orientation: horizontal & vertical configuration  
- Compatible with 3C (three-component) seismic systems  

Please provide:  
1. Technical specifications sheet  
2. MOQ and bulk pricing  
3. Lead time for 500 units  
4. Certifications (ISO/CE etc.)  
5. Customization options for industrial survey applications  

Samples required before bulk order.