Smart Temperature Controller Digital Display High Accuracy PID Control Thermostat with SSR Solid State Relay 220ACV Item Type: PID Temperature Controller Material: ABS Measurement Error: 1%+1 word, 0.5%±1 word, 0.2%±1 word (3 gears). (Additional Cold End Compensation Error: ≤±2℃ within the range of 0-50℃, temperature coefficient ≤0.05%/℃) Measurement Display Range: -1999-9999, -199-9999 (2 types). Alarm Range: Full Range Arbitrary Setting Relay Output Contact Capacity: 3A 220V, resistive or specified. Thyristor Trigger Signal: 15/40μS or rated 100mA, instantaneous IA (self triggering). Solid State Relay Output Signal: 15±8V 30mA Power Supply: 220V-±10% 50HZ Power Consumption: 4W Operating Environment: 0-50℃, relative humidity 35%-85%RH, non erosion and non strong electromagnetic field radiation environment Size: Approx. 112 x 48 x 96mm / 4.4 x 1.9 x 3.8in