Extech PH50 and PH60 Easy-to-use, rugged, and economical pH pens

Extech PH100 pH Meter features flat surface electrode, RENEW and CALibration alerts, memory and bargraph

Extech PH110 Unique pH stick meter with rugged refillable flat surface pH electrode

Extech EC400 ExStik Conductivity/TDS/Salinity Meter 4-in-1 multi-range sensor for measuring Conductivity, TDS, Salinity and Temperature

Extech EC410 ExStik Conductivity/TDS/Salinity Kit Waterproof meter with high accuracy multi-range sensor that measures four parameters

Extech EC500 Waterproof ExStik II pH/Conductivity Meter - Combination flat surface pH electrode with autoranging high accuracy Conductivity cell

Extech DO600 Waterproof ExStik II Dissolved Oxygen Meter - DO sensor with easy to replace screw-on membrane cap with optional extension cables