The recess for insertion of the cartridge in the first part being distant from the desk top prevents {HEAD ~ dust} and dirt to enter {TAIL ~ the housing} and impairing the sensitive measurement of the sample 
to enter
The recess for insertion of the cartridge in the first part being distant from the desk top prevents { HEAD ~ dust } and dirt to enter { TAIL ~ the housing } and impairing the sensitive measurement of the sample
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH