procurement of benchtop multiparameter ( ph / conductivity / tds / salinity / do ) for zonal laboratories under cwa ( w and s ) -i division , technical features: the multimeter will have large color graphic lcd display which should show reading, connection, time, date, sample id, user id, calibration information, etc. the multimeter will be capable to hold memory up to 2000 data points with time and date stamp. the data can be transferred to pc with usb or rs232 cable. the multimeter will have memory for up to 10 methods per channel. the meter will be supplied with electrode arm and probe holder to make it easier to maintain and place into sample solutions. the multimeter will have 4 channels / modules capable of measuring ph, conductivity, resistivity, salinity, temperature, total dissolved solids, dissolved oxygen and ions. the module can be connected with any probe / electrode.the meter will be supplied with ph and conductivity probe / electrode and will be capable of measuring ph, conductivity, resistivity, salinity, temperature and total dissolved solids.the multimeter and electrodes will be supplied with coa ( certificate of analysis ) and certificate of conformance ( coc ) . • ip54-rated housing handles splashes. technical specifications: ph -range-: 2.000 to 20.000, resolution: 0.1, 0.01, 0.001, relative accuracy : ± 0.002, calibration points : up to 6, calibration editing: yes, conductivity- range: 0.001?s to 3000 ms, resolution: 0.001?s minimum; 4 significant figures minimum, relative accuracy : 0.5 % reading ± 1 digit, reference temp. :5, 10, 15, 20, 25°c ( default ) , temperature compensation:linear ( 0 to 10.0 % / °c ) , nln, nlfu, usp / ep, compatible cell constant :0.001 to 199.9, calibration points :up to 6 points, calibration editing :yes resistivity- range: 2 ohm to 100 meg-ohm, resolution: 2 ohms-cm, relative accuracy: 0.5% ± 1 digit salinity- type: practical salinity or natural sea water, range ( salinity ) : 0.01 to 80.0ppt nacl equivalent; 0.01 to 42 ppt practical , resolution: 0.01, relative accuracy: ±0.1 tds- ranges: 0 to 200 ppt, resolution: 4 significant digits, relative accuracy: ±0.5% ± 1 digit, tds factor range : linear 0.01 to 10.00, , minimum number of modules: 3, methods: up to 10, data logging number of points: 2000 with time and date stamp power: universal ac power adapter, 90-260vac, 50-60hz