SonTek SonTek-IQ® Series
You may also need:
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SonTek-SL Series SonTek®-SL500 Side-Looking Doppler Current Meter
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SonTek-SL Series SonTek®-SL1500 Side-Looking Doppler Current Meter
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SonTek-SL Series SonTek®-SL3000 Side-Looking Doppler Current Meter