Hitachi L34 Instruction Manual page 22

The acoustic lens of the probe is manufactured very thin and
delicate to get the high resolution. Therefore, in case of wiping
out the ultrasound jelly or cleaning the surface of the acoustic
lens, please use the soft cloth or tissue paper and handle with
care. (See Fig.6)
Acoustic lens
Fig.6 Wiping out the ultrasound jelly or cleaning the surface
of the acoustic lens
DM 120918 v2
CAUTION
Soft cloth or tissue paper
- 19 - Q1E-EP1441