" TRANS INST." : Digital D.O. Meter WalkLab™, Portable 용존 산소(D.O.)미터, Economy-type, 0 ∼ 20.0 / 0.1 m " TINTOMETER" : Lovibond™ Inteligent Photometer PC 22 with LED-Filter, for wide Application Water An " SCHOTT-DURAN" : Dissolved Oxygen Meter “Precise” & “Multi-use” models, Portable 용존산소(D.O.) Meter, CONSORT" : Portable Multi-Parameter Analyser, 포터블 다용도 용존 산소(D.O.) 미터, with 200 Data Memory "YSI" 용존산소 측정기 ( DO Meter ) - 52 "HACH" DO Meter (용존산소계) 휴대용 HQ 10, 휴대용HQ 20 (종합카달로그 2006/7 P1193 )