I've had several. Over time they will become more accurate. Easy to set up. So far I've only used it with the Arduino Nano. I'll post later when and if I run it with ESP32 or 8266.
Cable tester BENETECH GM60
15 Review
ICQUANZX LCR-T7 Transistor Tester: Advanced TFT Diode Triode Capacitance LCR ESR Meter
14 Review
Room temperature and humidity sensor Aqara Temperature and Humidity Sensor white
25 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
π CAMWAY 6 Inch Digital Caliper with LCD Display, Electronic Vernier Caliper, 150mm Stainless Steel Feeler Gauge, Plastic Digital Caliper Set for Zero Setting Inside/Outside Diameter, Depth, and Step Measurement Tool
3 Review
π² Johnson RAS-1B Johnny Square: Professional Aluminum Rafter Square, 7'', Silver - Top Quality with 1 Square
8 Review
TV bracket Kromax DIX-18 black
52 Review
Kapro - 353 Professional Ledge-It Try & Mitre Square - For Leveling And Measuring - Features Stainless Steel Blade, Retractable Ledge, And Etched Ruler Markings - 12 Inch
23 Review