The STT-301 retro reflective marking measuring instrument, developed and produced by Beijing Runjie Tiandi Technology Co., Ltd., is a specialized optical measuring device used to measure the reflective performance of road markings. The measured parameter is the retro reflective coefficient R '(or specific brightness) of the markings, measured in mcd • lx -1 • m -2. This instrument is easy to operate and has reliable measurement values. It can be used for both laboratory and on-site measurements, and is the preferred instrument for measuring the optical properties of highway markings in production, quality supervision, engineering construction, supervision, and teaching research units.

1. Parameters

l Observation angle of the instrumentα=1.05°, angle of incidenceβ=88.76The complementary angle is 1.24 degrees.

l The color temperature of the light source is 2856K ± 50K (CIEA light source)

l The detector is a silicon diode+V（λ）Corrector, after being corrected by a filter, conforms to the CIE standard photometric observer's spectral luminous efficiency V（λ）The requirements.

l The measurement range of the reflectivity coefficient R 'is 0-1999 mcd · 1x-1 · m-2

l Continuous working time of battery/Measuring Time: ≈ 72 hours

l Data Storage/Data Memory: 30 Test Messages

l Screen/Display: 3.5 "320x240 (LCD)

l Computer connection method/Interface: None

l Charging method/Charger: 220VAC 50HZ; DC15V

l Power Supply: Lithium Battery

l Protection Class: IP54

l Operating Temperature: -15 ° C~+50 ° C

l Storage Temperature: -30 ° C~+85 ° C

l Operating Humidity: 0~100%, no condensation

l Volume (length x width x height)/Dimensions (LxWxH):

Net size: 705mm x 135mm x 135mm,

Including packaging dimensions: 770mm x 290mm x 210mm“

l Package: High end instrument box