DE WIT model 1888/48SST St.steel case dual pen portable 8 inch recorder, (1) 0-3,000 psi, cl. 1,0, back conn. 1/4 inch NPT female, (2) 0-100 degr.C., cl. 1,0, probe diameter 10 mm x 100 mm on back of recorder, Sonceboz battery chart drive, comes with 50 charts - CR-142688m comes with spare pens
