Offered exclusively in North America by TAPCO, Delta’s RetroSign® GR3 retroreflectometer is a
handheld instrument for measuring retroreflection of traffic signs. The GR3 measures the coefficient
of retroreflection, RA, and meets all U.S. and European standards, including the FHWA MUTCD.
FEATURES
Meets FHWA & ASTM specifications
Measures all types of retroreflective materials and colors directly without correction factors
Simultaneous triple observation angle measurements
Dual field aperture: 30mm and 15mm
Unmatched precise, sensitive and durable optical spectral response
Built-in precision WAAS GPS
Attachable RFID tag reader
Internal storage for 250.00 measurements
Lightweight & easy to use
Road Sensor Control (RSC) program facilitates quick USB data transfer, processing and report generation
Environmentally friendly Nickel Metal Hydride Battery
Optional extension pole with remote control
STANDARD SPECIFICATIONS
Optical Specifications
Geometry	ASTM-E-1709/WK9050: ÷4๐/ 0.2๐, 0.5๐, 1.0๐
Entrance Angle	-4๐
Observation Angle	0.2๐, 0.5๐, 1.0๐
Field of measurement, Ø	30 mm/ 1.2 in. and Ø 15/ 0.6 in.
Spectral Responsivity	Illuminant A and V () efficiency according to ASTM E1709 section 6.4.2 for selected filters
Range (cd·lx-1·m-2)	0 - 2000
Instrument dimensions
Length	295 mm/ 11.6 inch
Width	83 mm/ 3.3 inch
Height	324 mm/ 12.8 inch
Weight	2.0 kg/ 4.6 lbs.
Gross Weight	6.0 kg/ 13.2 lbs.
Electrical Characteristics
EMC	EN50081-1/ EN50082-1
RFID Tag Reader	HF (13.56 MHz; ISO 15693 and ISO 1443A/B)
GPS	WAAS
Power Supply	Rechargeable & replaceable Nickel Metal Hydride 9.6V, 2.4 Ah
External Charger	230 V AC/ 50 Hz; 110 V/ 60 Hz Charge time approx. 15 minutes
Data Memory	250,000 measurements
Data Retention	Typically 5 years
Interface	USB