Thermo Orion 967901 ORP Standard, 475 mL bottle Sieves 1/4-inch square wire mesh provides

1/4-inch square wire mesh provides excellent water circulation while securely retaining baitfish

A needle is included along with the gun

These graders  float at the right depth and the large diameter grader bars pass undersized fish damage-free

1/8" and 3/16" mesh sizes are available in 4'

Pumps are 115V

Thermo Orion 967901 ORP Standard, 475 mL bottle Sieves 1/4-inch square wire mesh providesProduct Code: 967901 This stable, ready to use standard requires no mixing and contain no organics or hazardous chemicals use straight out of the bottle. Use these standards as your relative mV standard and calibrate the offset of your sample. Redox potential values are 215 mV for Ag AgCl reference electrodes and 420 mV for standard hydrogen reference electrodes. Note: To allow for freshly dated product, this item is ordered in from the manufacturer