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Red digits is the PV (Process Value) display and the coded SV (Setting Value) display. Widely used on the automatic control system of Machinery, Chemical Industry, Light Industry, Metallurygy, Petrifaction, Heat Treatment etc. Intellective Digital Temperature Control Meters, made up of stable module of power supply, high capacity chip, and PID self-tuning adaptive control, SMD tecchnology has been used. ON/off control way, Red incoator light ON. Green indicator light Off. Display: Digital PV (Process Value), Coded Setting Valve; Display Range: 0 - 400 oC.