This thermometer has a display with a blue backlight. It allows measurements of temperature of the connected sensor.

Technical specifications:
Dimensions: 4.8 x 2.8 x 1.9 cm
Connector: Loop-through 4-pin Molex
Measuring range: 0 ° C to 90 ° C
Power: From 5V PSU rail

Extent of delivery:
1x Thermal Sensor G1 / 4 "inner thread to G1 / 4"inner thread with digital display - C / F display

L ° C means: No connection (check cable from sensor to display)
H ° C means: Reversed voltage / short (sensor-display cable connected the wrong way)
-xx ° C means: same as H ° C

Please note: The temperature is measured with a permanently attached sensors which can not be replaced.