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The IM-539 instruments have been designed especially to measure the Cylinder Heat Temperature (CHT) in Rotax® engines 912ULS/914.
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The IM-539 is available in 57 mm diameter.
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The instruments use a pointer thats turns 240º, witch gives them great resolution.
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Their display areas are divided into red, green and yellow zones in line with the ROTAX limits.
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This instrument Work with the VDO sender that is build in the ROTAX 912./914