Honeywell T100R Thermostat is a versatile device designed for hydronic heating systems where remote sensing is required. With its 2-meter capillary and sensor, it allows for precise temperature regulation by sensing the temperature at a distance from the control head. The control head features a knurled ring for easy attachment to control valves and a scale setting from 0 to 12 for precise temperature adjustment. The T100R is suitable for mounting on V100 or V135 valves from 3/4" to 1-1/4" sizes and has two temperature ranges: 10 to 50°C (50 to 122°F) and 30 to 70°C (86 to 158°F).