This mini temperature controller is an excellent and practical multi-function device for controlling the temperature in aquariums. Features: Mini and lightweight design Large clear LCD display Wide temperature range (-50 to 90 -90 ° C) (-58 ℉ -194 ℉) Wiring diagram for installation included (need instructions, please contact us) Suitable for the following machines: beer dispensers, fast cooling cells, cold rooms, fish refrigerators, freezers, mid-rise chillers/freezers, ice freezers, mini-bars, vertical display coolers/freezers, freezers, wine coolers. Features: Temperature measurement range: -50 to 90 °C (-58 to -194 °C) Control temperature range: -50 - 90 Deg.C (adjustable) Temperature difference control: 0.3 - 10 Deg.C (adjustable) Resolution: 0.1 Deg.C Accuracy: ± 1°C (-50 - 70 °C) Sensor: NTC sensor Sensor error time: 1 minute Relay contact capacity (heating): 10A (max) 250 V Relay contact capacity (cooling): 10 A (max) 250 V Compressor protection time: 1~10 minutes (adjustable) Operating temperature: 0 - 60 °C (32 ℉ -140 ℉). Storage temperature: -30 to 75°C (-22 to -147°C) Operating relative humidity: 20~85% (non-condensing) Alarm output: Buzzer Power supply: 110 ~ 220V AC ± 10%, 50/60 Hz. Power consumption: <3 W Cable length: 1 M Item size: approx. 84 x 69 x 34 mm (3.3 x 2.7 x 1.3 inches). Net weight: 138 g (4.87 OZ) Package includes: 1 x STC-1000 Temperature Controller 1 x 1M Sensor Probe 1 x user manual in English