Tsunagi Onsen is located on the banks of Lake Gosho in the western part of Morioka City, Iwate Prefecture. At the far end of the hot spring area stands a traditional Japanese-style onsen ryokan called “Tsunagi Onsen Shikitei”. We heard that Shikitei was using our wireless data logging system to manage the temperature of their hot spring water, so we visited them to learn more. Date July 2019 Place Tsunagi Onsen Shikitei (Morioka City, Iwate Prefecture) Models in Use RTR-500AW, RTR-502 Purpose Temperature management of hot spring water for onsen baths We spoke with the president, Mr. Mase, and Mr. Ito, a front desk staff member, in the lobby. At the start of the interview, the president shared his thoughts: “It’s been a real help to us.” “Honestly, it feels like a lifesaver.” Hearing this, we asked him to share more about their experience. We first asked how they had been managing water temperature before introducing the system. Q: Were you measuring the temperature of the hot spring water before you installed our data logging system? President Mase: Yes, we measured and checked the temperature of the bath at regular intervals. We used a simple stick thermometer and put it