DQL-2A Survey Instruments' Accessories Geology Metal Handheld Compass Specifications Damping time of needle 30~60s Graduation circle 0°~360° Dial ......
DQY-1 Geology Metal Compass with Mirror Specifications Damping time of needle 30~60s Graduation circle 0°~360° Dial scale 1° Precision of tubular ......
ADS108 Plastic prism with reflceting sheet white/orange color About us Geo-Allen Co., Ltd. was founded in 2002, in Suzhou, Jiangsu Province, 80km away ...