Precisely cure with these airtight mason jar lids! No more shaking your jar to get readings. Monitors Humidity & Temperature. Compatible with wide mouth jars only. Jar(s) not included.

Humidity measurement range: 10%-99%
Humidity measurement accuracy: +/-5%
Humidity sampling period: 10 seconds
Rated voltage: DC 1.5V (2 LR44 button cells included)
Temperature measurement range: -58℉-158℉
Temperature measurement accuracy: ±2℉ (under normal temperature)