E1C3H4O1G2R1A1P3H4
20 points
ECHOGRAPH is validvalid
a device for measuring things using sound waves [n ECHOGRAPHS]
an echo-sounder, used to measure the depth of water [n -S]
a device for measuring things using sound waves [n ECHOGRAPHS]
an echo-sounder, used to measure the depth of water [n -S]