Scigiene RD0370R is an extremely accurate reference thermometer accurate to +/-0.1C. It includes a full 3-point N.I.S.T traceable certificate at 3 points over -20C to 140C.
Features:
 Temperature Probe Specifications:
Sensor Type  | Platinum resistance thermometer sensor Pt 100 (4 wires) IEC751, class A  | 
Accuracy  | ±0.15°C ±0.002 measurement temperature  | 
Measurement Range  | -100 to 400°C  | 
Temp. Sensor Dim.  | Approx. 3.2mm ( 0.125”)  | 
Temp. Sensor Length  | Approx. 120 mm (4.72”)  | 
Cable Length  | Approx. 1100 mm (43.3”)  | 
Water-resistant  | IP67  | 
  
| 
   Temperature Range:   | 
  
   -100°C to +300°C (-148°F to +572°F)  | 
 
| 
   Resolution:   | 
  
   0.1°F/C  | 
 
| 
   Accuracy:   | 
  
   +/-0.1°C over -20°C to 100°C  | 
 
| 
   Sensor Types:   | 
  
   Platinum resistance for Pt-100,
  Pt-500, Pt-1000 (4 wires) selectable  | 
 
| 
   Power Supply:   | 
  
   3 x 1.5V AAA alkaline batteries  | 
 
| 
   Battery Life:   | 
  
   Approximately 100 hours  |