Apps like Halcon calibration

Here are some great alternatives to Halcon calibration by Marco Benocci :
Display Calibration
Display Calibration
★4.2
Screen & Display Calibration
Screen & Display Calibration
★3.8
Display Calibration
Display Calibration
★4.1
Clinometer + bubble level
Clinometer + bubble level
★4.5
Light Meter - Lux, Exposure
Light Meter - Lux, Exposure
★4.7
Accurate Bubble Level
Accurate Bubble Level
★4.4
Precise Level
Precise Level
★4.1
Clinometer
Clinometer
★4.2
Ruler+ (Donation)
Ruler+ (Donation)
★5.0
Lux Light Meter
Lux Light Meter
★4.4
Bubble Level
Bubble Level
★4.2
Distance Meter
Distance Meter
★3.4
Millimeter - screen ruler app
Millimeter - screen ruler app
★4.2
Millimeter Pro - screen ruler
Millimeter Pro - screen ruler
★4.7
Level Tool App
Level Tool App
★3.6
Smart Ruler
Smart Ruler
★3.5