WESTWOOD T40 WESTWOOD T-40 FLUE GAS SMOKE TESTER COMPLETE WITH CASE, PAPER AND SMOKE SCALE Reliable and durable instrument for measuring the smoke number of a flue gas sample. Flue gas is taken from an opening in the flue pipe and drawn through the smoke test paper mounted in the tester. Comparison of the test paper with the smoke scale determines the smoke scale number.
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