Using an OBS-3+ or OBS300, when would it be advantageous to use a 4X curve instead of a 1X curve?

The OBS-3+ or OBS300 provides two separate outputs to match the two turbidity ranges selected at the time of purchase. Use the curve that matches the turbidity range likely to be experienced during monitoring. Program the data logger to record and store data from each output, or choose which output to use automatically depending on the turbidity.

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