From UK seller 

Retro Survey Targets (100 Pack) 30x30 mm Perfect For Control Stations

VAT Invoice available

Specification:

• Brand new

• Colour: Yellow

• Size: approx. 30x30 mm

• Convenient to use.

• Greatly improve your work efficiency.

• Used on construction sites, tunnel engineering, subway engineering, bridge engineering, building construction, slope monitoring, ship survey etc.

Atmospheric Conditions:

• A: Dense fog, visibility 5 km, or strong sunlight, intense heat flashes

• B: Mist, visibility 20 km, or medium sun, slightly hot flashes

• C: Cloudy, foggy, visibility 40 km, no heat flashes

Accuracy:

• Standard measurement mode: 2mm +2 ppm

• Fast measurement mode: 5mm +2 ppm

• Tracking measurement mode: 5mm +2 ppm

• The average measurement mode: 2mm +2 ppm

• RL Short Mode: 3mm +2 ppm

• RL Long Range Mode: 5mm +2 ppm

Measurement time: (slightly different models of different instruments)

• Standard measurement mode 1.0 - 3.0 seconds

• Fast measurement mode 0.5 - 1.5 seconds

• Tracking measurement mode 0.15-0.3 seconds

• RL Long Range Mode 2.5 seconds

Package includes:

• 100x Yellow Reflector Retro Targets