Additional Details ------------------------------ Product description: Durable & highly accurate. Monitors wood stove performance. For single wall stove pipe only. Easily installed on stove pipe with magnetic attachment. For single wall stove pipe only Durable & highly accurate Monitors wood stove performance Indicates Correct Operating Temperature Burn efficiency range from 100 degree F to 850 degree F (40 degree C to 475 degree C) Easily installed on stove pipe with magnetic attachment.