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Summary of Accuracy Determinations for Four Mechanical Balances
 
the equipment
 
by David W. Davenport, 13 FEB-2000
 
Accuracy Summary for Three "Pocket" Mechanical Scales—Accura, Calibrön and Deering 10
 
Accura Scale Graph Calibron Scale Graph Deering 10 Gram Scale Graph
     
Conclusions: The Accura Scale is highly accurate and shows excellent linearity across its entire range.  Practically, it has the following accuracy limits:
Conclusions: The Calibrön Scale is highly accurate and shows excellent linearity across its entire range.  Practically, it has the following accuracy limits:
Conclusions: The Deering 10 Gram Scale is highly accurate and shows excellent linearity across its entire range.  Practically, it has the following accuracy limits:
     
Mass Range
Accuracy
Mass Range
Accuracy
Mass Range
Accuracy
</= 1.00 gram
>1.00 gram
± 0.025 gram
± 2.8%
</= 1.00 gram
>1.00 gram
± 0.0125 gram
± 1.25%
</= 1.00 gram
>1.00 gram
± 0.01 gram
± 1.5%
           

Download Acrobat nowDownload the complete detailed report for the Accura Scale

Download Acrobat nowDownload the complete detailed report for the Calibrön Scale Download Acrobat nowDownload the complete detailed report for the Deering 10 Gram Scale

Accuracy Summary for One Laboratory-Quality
Mechanical Bench Scale—Ohaus 310 Model
         
Ohaus Dial-O-Gram Graph
               
Conclusions: The Ohaus Dial-O-Gram 310 Model scale is highly accurate and shows excellent linearity across its entire range.  Practically, it has the following accuracy limits:
Linear Equation Accuracy Summary Table for Four Balances
 
Accuracy Indicators, from Linear Chart Information
Accura 4 Gram Scale
Calibrön 4 Gram Scale
Deering 10 Gram Scale
Ohaus 310 Scale (10 gram range)
 
% Slope error at </- 1 g
2.3%
0.7%
0.1%
0.1%
% y-intercept error at </- 1 g
0.2%
0.6%
0.7%
1.1%
 
% Slope error at > 1 g
2.1%
1.4%
0.5%
0.2%
% y-intercept error at > 1 g
0.3%
0.6%
0.2%
0.1%
 
% Slope error at Full Range
1.9%
0.8%
0.4%
0.0%
% y-intercept error at Full Range
0.2%
0.2%
0.1%
0.1%
 
Notes on "% Slope error": for the linear equation, y = mx + b,
% Slope error = the absolute value of (1 minus m) times 100
 
Notes on "% y-intercept error": for the linear equation, y = mx + b,
% y-intercept error = b divided by the maximum range of the scale times 100
 
Mass Range
Accuracy
</= 1.00 gram
>1.00 gram
± 0.017 gram
± 0.7%
Download Acrobat nowDownload the complete detailed report for the Ohaus 310 Model
                       

Methodology and Standard Weights for Accuracy Testing on Four Mechanical Balances

Features Comparison for Four Mechanical Scales, and Recommendations

The advent of lower cost high precision weigh sensors and China's ability to produce quality digital weighing scales has resulted in the manufacturer's of Calibron, Deering and other mechanical scales to cease production. We have no remaining stock on these mechanical scales and recommend for an alternative the My Weigh Palmscale 8.0 (300g x 0.01g), MyWeigh Palmscale 7.0 (200g x 0.01g) or My Weigh Durascale D2-300 (300g x 0.01g)

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