GPS INSTRUMENT; TYPE: MEASUREMENT; WORKING RANGE: RANGE 3-5KM; FREQUENCY (HZ): 450MHZ; OPERATING TEMPERATURE: #40 TO 65°C; MATERIAL: STEEL; DIMENSIONS: 30CM; ADDITIONAL FEATURES: MUST HAVE 5 GPS SIGNALS, 5 GLONASS SIGNALS AND 5 GALILEO SIGNALS; ADDITIONAL FEATURES:5.5H, 0.5W, COORDINATE MEASUREMENT INSTRUMENT,TRIMBLE MODEL R12; SUGGESTED BRANDS: TRIMBLE.