Technology Services, Weights and Measures Division, NIST

NIST Handbook 143
State Weights and Measures Laboratories Program Handbook


Table 14. Summary of Environmental Facility Guidelines (as described in Section 7)

Lab
Temperature range °C

(set point)
± Temp variability °C
Max change per hour °C
Temp

accuracy °C
RH percent range
RH percent accuracy
Pressure accuracy

Pa
Mass I 20 - 23 1.0 0.5 0.1 30 - 55 5 65
Mass II 20 - 23 2.0 1.0 0.5 30 - 55 10 135
Mass III 18 - 25  

1.0

  

30 - 60

  

 

Volume - G

 20 - 23 2.0 1.0 0.1/0.5 

(H2O, air)

 30 - 55 10  

Volume - T

 18 - 25 1.0  

0.5

 20 - 60  

135
Dimensional 20 (18 - 22) 1.0  

0.5

  

 

 

Temperature

  

2.0

  

 

30 - 55

  

 

Tuning Forks

  

 

 

 

 

 

 

Hydrometers

  

 

 

0.01 (solution)

  

 

 

Time

  

 

 

 

 

 

 

Moisture

 20 - 23 2.0 1.0 0.5 30 - 55  

 

 

Program questions: Weights and Measures

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