5PCS Mini Level-Mini Bubble Spirit Level Small Square Quality Measuring Instruments Small Levels Layout Tools for Picture Hanging(15×15×40MM) - Amazon.com
Magnetic Horizontal Plastic Mini T-type Spirit Level Acrylic level Vails Ruler Horizontal Measurement Instrument Level Bubble - AliExpress
SF98 - Acrylic screw on level, 98mm long, sensitivity 43'/2mm