- Palmer All Pro's deliver legibility, economy, and performance to any application: HVAC, Pipe/Valve/Fitting, Conductor, or Industrial Process. 3" dial available in back, or all angle case styles. Features dual °F & °C Dials with exceptional legibility. Ranges cover temperatures from -40°F (-40°C) up to 500°F (260°C). °F Single Scales also available. Standard stem lengths are 2 - ½", 4", 6", 9" or 12". Longer stem lengths available on special order. Standard Connection is 1/2" NPT. Features a sealed case/bezel design for maximum moisture protection. Lens is of instrument quality glass. Accuracy is ±1% of range, full scale. External recalibration on all 3' models. Case and bezel ring are Polished Type 304 Stainless Steel Case/Bezel is permanently sealed against moisture. Stem is polished Type 304 Stainless Steel. Fitting is 304 Stainless Steel. 7/8" Hex and 1/2" NPT Threads. Dial face has black graduations and numerals on white glare-free background. All dial ranges are dual °F and °C. Pointer is aluminum high-visibility black with tapered tip for maximum legibility. Lens is instrument quality glass.