Infrared Sensors work best with black body, carbon structures. They work poorly with shiny metal surfaces and liquid surfaces. For copper tubing its always best to color the surface with a black grease pen. For liquids they are just poor. Best to shoot the same flat object submerged in the liquid long enough to reach water temperature.
Every year I have people concerned that their domestic hot water system is faulty because their Infra-red thermometer is showing different temperatures all over their piping system. The Rocket Scientists at MIT that designed the early and expensive Micro-Scanner supplied a Nisan black grease pencil with each unit and detailed directions on using it with different materials. Directions more detailed than those supplied by Harbor Freight and others.
Touring Kayak Paddles
Recreational Kayak Paddle
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