Hand held pH meters	Hand held ORP meter	Hand held conductivity meter
HM-20P/21P	RM-20P	CM-21P
lWater proof construction（IP67） lData storage function（300 points)auto hole & interval function Inexpensive normal type（20P）& sophisticated type（21P） lRS-232C,analog output,external printer connecting function Meas.Range：PH0.00～14.00；0～99.9℃（20P，21P）0～1999mV（21P）	lWater proof construction（IP67） lData storage function （300 points）auto hold & interval function Water proof construction（IP67） lMeas.Range：0～1,999mV；0～99.9℃	lConduct./resistivity/salinity/ temp.measurable lWater proof construction（IP67） lCell constant stored cell adopted lData storage function （300 points）auto hold , interval function lExt.printer connectable,RS-232C,analog output lMeas.Range：0～19.99s/m0.05Ω·m ～1MΩ·m salinity：0.00～4.00%，0～80℃
Hand held conductivity meter for pure water	Hand held dissolved oxygen meter	Hand held pH/ion meter
CM-21PW	DO-21P	IM-22P
lConductivity/resistivity/temp measurable lTemp.compensation of pure water region lWater proof construction（IP67） lCell constant stored cell adopted lData storage function （300 points）auto hold , interval function lExt.printer connectable,RS-232C,analog output lMeas.Range：0～19.99ms/m.0～80℃0.5Ω·m ～19.99MΩ·m	lSalinity,& ATM comensation function lWater proof construction（IP67） lCalib.data storable electrode lData storage function （300 points）auto hold , interval function lExt.printer connecting function,RS-232C,analog output lMeas.Range：0～19.99mg/L.0～199%（standard）；0～50mg/L.0～500%(option);0～50℃	lIon,PH measured /displayed lWater proof construction（IP67） lCalib.data storable electrode(PH) lData storage function （200 points×2），auto hold & interval function lExt.printer connecting function,RS-232C,analog output lMeas.Range：PH0.00～14.00.0～±1999mV 0.1ug/L-400g/L (depending on ion electrode)0-99.9℃(PH/ORP)
Hand held pH/conductivity meter	Hand held conductivity meter	Metal oxide meter
WM-22EP	CM-1K	HM-17MX
lSimultaneous measurement of PH/conductivity lWater proof construction（IP67） lCalib.data storable electrode lData storage function （200 data×2），auto hold & interval function lExt.printer connectable,RS-232C,analog output lMeas.Range：PH0.00～14.00;0～±1999mV 0～19.99s/m;0.05Ω·m ～1MΩ·m 0～99.9℃(PH/ORP)0～80℃(cond)	lPortable type with analogue display lOperable with single 6F22 battery lWide meas. range with scale for resistivity on meter. lEase of meas. attained on site/ field lMeas.Range: 01-105uS/cm-10MΩ/cm(4 ranges)	lIntended exclusively for meat,cheese & bread dough lNon-glass pH sensor,flqt or stick type available as option lHigh speed response (approx.3 sec.) lDrip-proof constuction,25 points data storage  lMeas.Range：PH0.00～14.00,-5～100℃