If you have questions about our products you own, Fill out the form below and we will answer any questions you have. Tips: Fields marked with*are required. Ultra High Accuracy Gyro Theodolite ER-GT-2 (≤3.6")◆Orienteering accuracy: ≤3.6" (1σ)◆Weight (excluding theodolite): ≤20kg◆Volume (no theodolite): ≤Φ240mm×h480mm