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Action ratio gauge, ERWIN
 
Lupe
Item No.
434535
your price
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Stock info.

Quantity
x 1 pce
Smallest discharge quantity: 1 pce
General instructions for the item ordered
 
This gauge provides fast, precise measurements of grand piano action ratios.

The sand-weighted gauge depresses one key exactly 6mm. Measure the amount of resulting hammer rise, and refer to the chart on the top of the gauge to determine the action ratio. Download the PDF below for more detailed instructions and helpful information on using the gauge for optimal results.
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