I have been using similar devices in industry for many years. This works as I expect. It is designed to be placed on a metal surface to which magnets can be attached. It takes about 20 seconds for the temperature sensor spring to warm up and start turning the dial.
Room temperature and humidity sensor Aqara Temperature and Humidity Sensor white
25 Review
ICQUANZX LCR-T7 Transistor Tester: Advanced TFT Diode Triode Capacitance LCR ESR Meter
14 Review
VIVREAL 4 In 1 Stud Finder Wall Scanner With LCD Display - Center Finding Beam Finder And Sound Warning For Wood, AC Wire, And Metal Studs (Black/Silver)
24 Review
Detector Bosch GMS 120 Professional
28 Review
➕ Stainless Steel L-Square, Size 3-Inch x 4-Inch, Zona 37-434
8 Review
Kapro 307-08-TMS Try And Mitre Layout And Marking Square With Stainless Steel Blade, 8-Inch Length
18 Review
Triangle Group TR918 225/45 R18 95V summer
61 Review
📏 Johnson Level and Tool 400EM-S 12-Inch Heavy Duty Metal Combination Square for Professionals, with Inch/Metric Measurements, Silver - 1 Square
8 Review