Are you looking for a professional, yet hygroscope? these are hygroscopes, made of plastic material. Humidity display resolution is up to 1%, The length of sensing line can be (or built in), they are one of the for you. Features - Color: Black - Size: About 4.5 x 2.5 x 1.5cm. - Material: Plastic 1. The LCD display 2. Machine size: 47.6x28.4x15.5mm Embedded hole size: 44.3x25.3mm 3. LCD size: 40x22.5 mm 4. Weight: 25g 5. Temperature display 8. The default temperature is ° c (choose ° f). 9. Temperature measurement range: -50 degree centigrade ~ 70 degree centigrade Humidity measurement range: 20%~90% 10. Temperature display resolution: 0.1 degree centigrade(0.2 fahrenheit scale) Humidity display resolution 1% 11. Temperature and humidity sampling period 10 seconds (1 minute) 12. Temperature measurement accuracy ±1 degree centigrade Humidity measurement accuracy ±5% 13. Temperature and humidity prompt 14. Rated voltage .5v - Made of plastic material. you can use them for a long time. - Large-character display, clear to read. - Low power consumption and high stability & accuracy. - Display temperature, humidity. - Their surface is smooth, you will have the good skin feeling Package list: 3 x thermometer