The LDST301C Retroreflectometer is a specialized instrument for measuring the optical performance of reflective road markings, providing convenient testing for construction quality control. The instrument consists of a main measuring unit, power supply, charger, and standard calibration plate. It complies with the national standard "Quality Requirements and Testing Methods for Road Traffic Markings" and the transportation industry standard "Road Marking Coatings". 
The instrument features: 
All-weather measurement capability, day or night, outdoors or indoors. 
Simple operation with intuitive digital display of retroreflection coefficient values. 
Equipped with a standard calibration plate using data transfer method for high accuracy calibration. 
Measurement geometry meets Ministry of Transport industry standards with 1.05° observation angle and 88.76° entrance angle. 
Compact size, lightweight design, and easy portability. 
Technical specifications: 
Observation angle (α): 1.05°; 
Entrance angle (β): 88.76°; 
Light source color temperature: 2856K (CIE Standard Illuminant A); 
Detector: Silicon photodiode + V(λ) corrector, meeting CIE standard photometric observer spectral luminous efficiency function V(λ) requirements; 
Retroreflection coefficient (R′) measurement range: 0-1999 mcd·lx?1·m?2; 
Display: 3?-digit LCD digital display; 
Power supply: Rechargeable lithium-ion battery.