1I. Warning Notice◆ Before using this instrument, please make sure you have read and understand the user manual.Inspect the calibrator for any damages before use.◆Do not apply more than 30V between any two terminals or between any terminal and ground.◆When using the calibrator to measure or output the correct wiring, mode and range must be used.◆To avoid any potential damage to other devices when testing, please adjust the calibrator to the correct mode before◆connecting the test leads.Replace the batteries as soon as the battery symbol flashes.◆Before removing the battery door, remove all test leads from the calibrator.◆2. Product DescriptionADT209/210 is a multi-function, durable, hand-held loop calibrator. This calibrator offers six primary functions: currentoutput, analog transmitter output, voltage measurement, switch measurement, transmitter loop measurement, and currentmeasurement. Each unit comes in a compact, design such that the calibrator can be operated easily with oneergonomichand. The large, high contrast VA screen clearly displays the results. Each unit comes standard with an IP54 rating.The ADT209 0.03%RD accuracy, while the ADT210 provides higher accuracy as 0.01%RD.provides