tachymeter scale有一个测速计;表圈被测速尺规
autoreducing tachymeter[测] 自动简化视距仪
speed tachymeter速度计
Electronic Tachymeter电子速测仪
tachymeter surveying视距仪测量
t tachymeter流速计
selfreduction tachymeter自动归算测距仪
tachymeter survey视距测量
tacheometer tachymeter视距仪
N（名词） a type of theodolite designed for the rapid measurement of distances, elevations, and directions 视距仪 [surveying]