Based on what I found on the web the factor is usually 385. Type 391 is available but a special order from Temp-pro. Bought one of these to connect to Omega PID. At 100 degrees Fahrenheit, there was less than 1/4 degree difference compared to a 1/10 degree certified yellow backed mercury thermometer.
Kapro - 353 Professional Ledge-It Try & Mitre Square - For Leveling And Measuring - Features Stainless Steel Blade, Retractable Ledge, And Etched Ruler Markings - 12 Inch
23 Review
TV bracket Kromax DIX-18 black
52 Review
π² Johnson RAS-1B Johnny Square: Professional Aluminum Rafter Square, 7'', Silver - Top Quality with 1 Square
8 Review
β Stainless Steel L-Square, Size 3-Inch x 4-Inch, Zona 37-434
8 Review