Racing Rings consists of three rods one each of copper, aluminum and PVC, Ring magnet is dropped down the PVC rod, it falls unobstructed, Two metal rods create an induced magnetic field to that adds resistance to the rings travel, metals are different, they fall at different rates
Measures [degree]C/F. Range is -50 to 150[degree]C. Stainless steel probe. Has an accuracy of +-0.5[degree]C between -20 and 100[degree]C. Resolution is 0.1[degree] from -20 to 200[degree]C. Stem length: 20.3cm. With 1.5V silver-oxide battery. NIST traceable.
Measures [degree]C/F. Range is -50 to 300[degree]C. Stainless steel probe. Has an accuracy of +-1[degree]C between -20 and 100[degree]C. Resolution is 0.1[degree] from -20 to 200[degree]C. Stem length: 28.9cm. With 1.5V silver-oxide battery. NIST traceable.
Reads [degree]F and C. Built-in clip. 6mm LCD. Readings updated every second. Range: -50 to 300[degree]C. Accuracy: +-0.2[degree]C. Stem length: 88.9mm. Stem diameter: 3.5mm. Overall length: 178mm. NIST traceable. Includes case and battery.