Field Inspection Manual — Non-Automatic Weighing Devices

Part 4, Section A: Abbreviations and Symbols Accepted in Canada

The following tables list the acceptable symbols and definitions of units of measurement used for displays and printed receipts as well as the marking of devices. The symbols or abbreviations shown are the preferred ones, although in some cases, others may be acceptable. Internationally recognized (OIML, ISO, IEC, DIN) symbols or abbreviations are generally acceptable if they do not cause confusion. The symbols listed in the "Unacceptable Symbols" column are not appropriate and should not be used. Any marking which may be confused with other commonly used symbols or markings should also be avoided.

Common Mass Symbols
Unit Definition Symbol Unacceptable Symbol
kilogram See W&M Act, Sch. I kg KG, kilo
gram 0.001 kilogram g gr, gm, G, GM
tonne (metric ton) Footnote 1 1000 kilograms t T, TN, tn
ton Footnote 2 2000 pounds tn t, TN, T
pound 0.453 592 37 kilogram lb LB, lbs, #
ounce 116 pound oz OZ
dram (drachme) 116 ounce (mass) dr ʒ
grain 17000 pound gr GRN, grn, GN, g
troy ounce 480 grains tr oz  
carat 200 milligrams ct C, k, kt
Additional Authorized Symbols
Unit Definition Symbol Unacceptable Symbol
acre 4840 square yards no symbol allowed no symbol allowed
bushel (boisseau) 8 gallons bu  
chain (chaîne) 22 yards ch  
fluid dram (drachme fluide) ⅛ fluid ounce fl dr
fluid ounce (once fluide) 1160 gallon fl oz US fluid ounce
(1128 US gallon)
foot (pied) ⅓ yard ft (pi)  
gallon (imperial) 454609100000000 gal US gallon
(378541100 000 000 m³)
inch (pouce) 136 yard in (po)  
litre 1/1000 L, l, ℓ  
metre See W&M Act, Sch.I m M
mile (mille) 1760 yards mi  
pint (chopine) ⅛ gallon pt (chop)  
quart (pinte) ¼ gallon qt (pte)  
yard (verge) 914410000 metres yd (vg)  
Obsolete Authorized Symbols Footnote 3
Unit Definition Symbol Unacceptable Symbol
cental/hundredweight (quintal) 100 pounds ctl or cwt  
chain (chaîne) 22 yards ch  
cord Footnote 4 128 cubic feet (ft³) stacked roundwood no symbol allowed no symbol allowed
fluid dram (drachme fluide) ⅛ fluid ounce fl dr
furlong 220 yards no symbol allowed no symbol allowed
gill (roquille) 132 gallon gi  
link (chaînon) 1/100 chain li (chon) l, lnk
peck (quart de boisseau) 2 gallons pk  
rod, pole or perch (perche) 5½ yards no symbol allowed no symbol allowed
Gravimetric Device Markings and Symbols
Definition Markings & Symbols Unacceptable Markings & Symbols
zero set zero set  
centre of zero centre of zero  
tare set tare set  
tare clear tare clear  
tare in use tare in use  
NAWD accuracy classes NAWD accuracy classes I, II, III, III HD, IV
1, 2, 3, 3 HD, 4
Maximum number of verification scale intervals nmax  
Minimum verification scale interval emin  
Actual scale interval d  
Verification scale interval e  
Number of scale intervals n  
Device capacity Max  
Gross gross, G, GR  
Tare tare, T, TR, TA  
Net net, N, NT  
Manual weight entry manual weight
MAN WT, MANUAL WT, MAN WEIGHT
M, MW, MAN

Revisions

Rev. 2

  • Reformatted tables
  • Moved obsolete authorized units to separate table
  • Added IEC, ISO and DIN 30 600 symbols
  • Added references to the W&M Act and Regulations in the "Definition" column.

Rev. 1

  • Reformatted the definition of the gram
  • Removed unit Ton (tonne) from Additional Authorized Symbols

Footnotes

Footnote 1

In order to prevent confusion, reference to tonne should be avoided if possible and the kilogram used instead.

Return to footnote 1 referrer

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Footnote 2

In order to prevent confusion, reference to ton should be avoided if possible and the pound used instead. The symbol for ton (tn) should also be avoided. Spelling out the unit is preferable.

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Footnote 3

Obsolete units that are still authorized but should be avoided if possible.

Return to footnote 3 referrer

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Footnote 4

Cord is a valid and authorized unit, but cubic metre (m³) is preferred.

Return to footnote 4 referrer

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