Discontinued Products & Recommended Replacements

YSI products are built to last (just look at the model 58!).  Eventually there comes a point where new technology and innovation provides better features and benefits and those trustworthy meters are retired.  

Here's a listing of the products we've developed over the last 60 plus years that have served us well but are now discontinued.  We've provided a suggested list of product replacements to help in your search.

If you have one of these discontinued meters and need a manual for it, check the listing near the bottom of this page.

Product Replacement
30 Conductivity Meter EC30A, EC300A, Pro30
31 Conductivity Bridge 3200, 3100
31A Conductance Bridge 3200, 3100
32 Conductance Meter 3200, 3100
33 S-C-T Meter EC300A
34 Conductance-Resistance Meter 3200
35 Conductance Meter 3200, 3100
50 Dissolved Oxygen Meter ProODO, Pro20DO200A
50B Dissolved Oxygen Meter ProODOPro20DO200A
51 Oxygen Meter ProODOPro20DO200A
51A Dissolved Oxygen Meter ProODOPro20DO200A
51B Dissolved Oxygen Meter ProODOPro20DO200A
52 Oxygen Meter
(1960's version)
ProODOPro20DO200A
52 Dissolved Oxygen Meter
(2000's version)
ProODO, Pro20, 58
54ARC and 54ABP Dissolved Oxygen Meters ProODO, Pro20, DO200A
55 Oxygen Monitor
(1960's version)
ProODO, Pro20, DO200A
55 Dissolved Oxygen Meter ProODO, Pro20, DO200A
56 Dissolved Oxygen Monitor ProODO, Pro20, DO200A
57 Dissolved Oxygen Meter ProODO, Pro20, DO200A
Product Replacement
59 Dissolved Oxygen Meter ProODO, Pro20, DO200A
60 Handheld pH Meter pH10A, pH100A, Pro10
63 Handheld pH, Conductivity Pro1030
80 Laboratory Recorder None
80A Single Channel and Model 81A Dual Channel Laboratory Recorders None
85 Handheld Oxygen, Conductivity, Salinity, and Temperature System Professional Plus, Pro2030
91 Dew Point Hygrometer None
95 Handheld Dissolved Oxygen ProODO
550 Handheld Dissolved Oxygen Meter ProODO, Pro20
550A Handheld Dissolved Oxygen Meter (Discontinuation: Dec 22, 2016) ProODO, Pro20
1500 Sport Lactate Analyzer None
2300 Stat Plus Glucose/Lactate Analyzer 2900D Biochemistry Analyzer
2700 Select Biochemistry Analyzer 2900D Biochemistry Analyzer
2700M Online Monitoring & Control System 2900M Online Monitoring & Control System
5200 Recirculating System Monitor 5200A
5300A Biological Oxygen Monitor System None

 

Product Replacement
610 Display/Logger 650MDS
610D / 610DM Display Logger 650MDS
3000 T-L-C 600LS, CastAway™ CTD
3560 Water Quality Monitoring System Professional Plus, 556MPS
6000UPG Multi-Parameter Water Quality Monitor Multiparameter Sondes
6200 Data Acquisition System Systems Integration
6920DW, 600DW None
7100 Multiparameter Bioanalytical System 2950D Biochemistry Analyzer
8500 CO2 Monitor None
9600 Nitrate Monitor None
ADV6600 Environmental Monitoring System EXO2, SonTekADV
BODAnalyst Software BOD Analyst Pro™
PC6000 Software EcoWatch Software
SondeCom Software for Palm OS None

Featured Products

MultiLab 4010-3

Three channel benchtop multiparameter instrument

$1,900.00

EXO2 Multiparameter Sonde

6-port Water Quality Sonde with Anti-fouling Wiper

Request Pricing

IQ SensorNet 2020 XT Controller

Modular water quality system for a complete sensor network allows for connection of 20 sensors

Request Pricing

2900M Online Monitor & Control System

Two Chemistry Online Monitor & Control System

Request Pricing

ProDSS

Digital Sampling System multiparameter​ handheld provides extreme flexibility. Meter Only.

Request Pricing

5200A Multiparameter Monitoring and Control Instrument

Multiparameter Aquaculture Monitor

Request Pricing

TruLab pH/ISE 1320

Dual channel benchtop pH/ORP/ISE instrument

$1,595.00

ProODO Optical Dissolved Oxygen Instrument

Optical Dissolved Oxygen Digital Handheld Instrument. Meter Only.

$725.00

IQ SensorNet P700 IQ Orthophosphate Analyzer

IQ SensorNet P700 IQ Orthophosphate Analyzer

Request Pricing

2950D Biochemistry Analyzer

Six Chemistry Analyzer

Request Pricing

5500D MultiDO Optical Monitoring and Control Instrument

MultiDO Optical Aquaculture Monitor

Request Pricing

ProOBOD Optical BOD Probe

Self-Stirring Optical BOD Probe for ProODO and ProDSS instruments

$940.00 - $960.00

EcoSense pH100A Meter

pH, mV, Temperature. Instrument Only

$265.00

Professional Plus (Pro Plus) Multiparameter Instrument

Multiparameter Instrument for DO, Conductivity, Salinity, pH, ORP, Ammonium, Nitrate, Chloride, Temperature and more. Meter Only.

$1,220.00

EcoSense ODO200 Handheld

EcoSense Optical Dissolved Oxygen and Temperature Instrument. Instrument Only.

$330.00