Use ancilla in a sentence. an aid for use as in understanding or accomplishing something; often, specif., a handbook, or manual. Origin of ancilla. see ancillary.
Making the world better, one answer at a time. The accelerometer in mobiles is used to measure the orientation or vertical and horizontal positioning of the phone. The most basic application of this is the device knowing when to alternate the view of the screen depending on how you are holding it.
Stroboscopes are used to measure revolutions, velocity and frequency of rotating components or moving parts. Online you will be able to find stroboscopes by PCE and several other companies. Some stroboscopes can be used without a mains adaptor as they have rechargeable batteries and each model is light and easy to use.