As of 1/9/2025 there could be a 2 to 3 week delay in shipping 461 due to demand.  We hope to be caught up soon.

Precision manufactured treated cotton tubular wet bulb wick. We set the standard for quality. This wick is used in the hatchery and HVAC industries for determining the aqueous vapor in the atmosphere. Applications include use with sling Psychometric and various types of thermocouples. Made to slide over a probe or thermometer bulb. Finely braided with very fine high quality 100% cotton yarns. These wicks slide well over thermometer bulb or probe. 

Wet Bulb Lab wick is available in 6 sizes, sized by Internal Diameter. Determine the size by measuring your probe with vernier calipers. 

Spool sizes vary:

1386 - 1/16 inch (1.59 mm); about 500 yard (457.2 meter) spool

4430 - 1/8 inch (3.18 mm); about 500 yard (457.2 meter) spool

1351 - 3/16 inch (4.76 mm); about 250 yard (228.6 meter) spool

461 - 1/4 inch (6.35 mm); about 250 yard (228.6 meter) spool

735 - 3/8 inch (9.5 mm); about 250 yard (228.6 meter) spool

1090 - 1/2 inch (12.7 mm); about 125 yard (114.3 meter) spool

See also the Fluid/Incubator line of wick material for similar applications.

Made in the USA.