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