YSI Economy Oxygen Meter with Optional Probes Dream Pond these diffusers are easy to

these diffusers are easy to clean

digestibility and growth

Safe for freshwater and saltwater tanks

Fits 3" Schedule 40 PVC elbow or coupling

water depth

YSI Economy Oxygen Meter with Optional Probes Dream Pond these diffusers are easy toSPECIAL ORDER ONLY The D200 Economy Oxygen Meter from YSI Meters is designed for quick, accurate oxygen and temperature readings! This handheld, easy to use meter features a watertight IP67 housing, so there's no need to worry about the meter getting wet. Automatic temperature compensation Manual salinity compensation Low battery indicator with 500 hour battery life Screw on cap membranes with low stirring, fast response probe