WSM853-FDBAE3A - Ultrasonic heat meter 6 m³/h, mounting length 260 mm, connecting thread 1 1/4", sensor M10 x 1 mm, 38 mm, M-bus communication, 2 pulse inputs, 6 year battery
Siemens Landis & Staefa RWD32 Thermostat Remote Controller Used Good Condition | eBay
بالدارجة_how to change the battery of PLC S7 400 - YouTube
UH50-A36-00 - Θερμιδομετρητής υπερήχων θέρμανσης 2.5 m3/h, DS M10x1 mm, G 1"