The two numbers are measured at different concentrations

and high moisture values

the 18-ES has a 17" steel shaft

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Incorporating plug-in ports for the optional Hygro-i2® relative humidity probe testing per ASTM F2170 and heavy-duty pin-type wood probes

Stainless Strainer Adapter 1/4" Male NA0805-SS Safety & PPE The two numbers are measuredThis Stainless Strainer Adapter 1 4" Male will be used with the Mesh Stainer (NA0803) and the Strainer Body 1 4" S S (NA0802 SS) to make a Filter System suitable for most tools. This stainless steel strainer adapter features a 1 4" male connection, designed to integrate seamlessly with the Mesh Strainer (NA0803) and Strainer Body 1 4" S S (NA0802 SS). Together, these components form a complete filtration system compatible with most cleaning equipment.