Overview Other Details Reviews Product Description SAME AS TR21, EXCEPT SPECIAL 10K OHM OUTPUT FOR AVERAGING MULTIPLE SENSORS. Other Details 0.2 Product Videos Custom Field Product Reviews (No reviews yet) Write a Review Write a Review × Honeywell Honeywell TR21-A/U Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name *Email *Review Subject *Comments