Why does my probe read outside the 250 to 1000 mV range that Decagon states for probe output?
If an ECHO probe reads below 250 mV or above 1000 mV, there is a good chance that it is defective, assuming the probe is wired and operated correctly. If you have another ECHO probe, try plugging that probe into the readout device to ensure that the connector and readout device are functioning properly. If there is a problem with the probe, contact Decagon for a replacement.