Theory:Hygrometer Max Measuring Temperature:100C - 119C Display Type:DIGITAL Certification:NONE Style:Standing and Wall Hanging Usage:Industrial Model Number:STC-3008/3018/3028 Temperature hygrometer controller Power Type:Charger Display Size:1.9 Inches & Under Power supply:AC110-220V DC12V/24V Resolution:0.1 Accuracy:+- 1C Relay output:10A Housing material:gray ABS flame retardant plastic shell Net weight:120g Model difference: STC-3008 STC-3018 STC-1000 is a temperature controller STC-3028 is a temperature and humidity controller STC-3008 3018 3028 Dual Digital Temperature Controller Hygrometer C/F Thermostat Two Relay Output AC 110V 220V DC 12V 24V 10A STC-3008 Function Power supply: 110-220VAC plusmn 10%, 50/60Hz (or DC12V / DC24V) Measuring temperature range: -55 deg C ~ +120 deg C Resolution: 0.1 Accuracy: plusmn1 degC Relay output contact capacity: heating: 10A/240VAC, cooling: 10A/240VCA Sensor h type: imported NTC sensor, line length 1 meter Housing material: gray ABS flame retardant plastic shell Net weight 120g gross STC-3018 Function Power supply: 110-220VAC plusmn 10%, 50/60Hz (or DC12V / DC24V) Measuring temperature range: -55 deg C ~ +120 deg C Resolution: 0.1 Accuracy: plusmn1 degC Relay output contact capacity: heating: 10A/240VAC, cooling: 10A/240VCA Sensor h type: imported NTC sensor, line length 1 meter Housing material: gray ABS flame retardant plastic shell Net weight 120g gross STC-3028 Function Power supply: 110-220VAC plusmn 10%, 50/60Hz (or DC12V / DC24V) Measuring temperature range: -20 deg C ~ +80 deg C Measuring humidity temperature range: 00%RH+100%RH Accuracy: plusmn1 degC 0.1% RH Relay output contact capacity: 10A/240VAC, Integrated sensor, line length 1 meter Housing material: gray ABS flame retardant plastic shell Net weight 120g gross