The THDX is a uniquely versatile instrument. Accessories include extension cables for the instrument's probe for remote monitoring applications. The THDx internally averages readings together. In battery mode the update rate is slowed to conserve power and since the unit takes 1 new reading per update, the response is also slowed.
Battery power is recommended for back-up only.
Probe dust filter will slow down response time. Accredited Calibration 3-pt.