kagayaさんの見る限り使い方さえ間違えなければ-20℃くらいまでなら問題なさそう

https://twitter.com/kagaya_work/status/1078201445625692161
https://twitter.com/kagaya_work/status/1078298615691370496
https://twitter.com/kagaya_work/status/1078304943323340800
https://twitter.com/kagaya_work/status/1079557087452049409
https://twitter.com/5chan_nel (5ch newer account)