TR21-H | 20K OHM NTC NON-LINEAR TEMP WALL MODULE W/ HUMIDITY SENSOR Incl. Vendor Surcharge $244.09 SKU: TR21-H MANUFACTURER: Honeywell Parent Item Parent Item - Additional Cost Has Item Option Quantity -+ If you add this item, you're only $556 away from free shipping! Add to Cart Add to Cart Current Stock: 8 Details TR21-H | 20K OHM NTC NON-LINEAR TEMP WALL MODULE W/ HUMIDITY SENSOR DetailsBackDetailsTR21-H | 20K OHM NTC NON-LINEAR TEMP WALL MODULE W/ HUMIDITY SENSOR