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# Custom equality comparers
To enable easier verification of custom Unity type values in your tests we provide you with some custom equality comparers:
* [ColorEqualityComparer](./reference-comparer-color.md)* [FloatEqualityComparer](./reference-comparer-float.md)* [QuaternionEqualityComparer](./reference-comparer-quaternion.md)* [Vector2EqualityComparer](./reference-comparer-vector2.md)* [Vector3EqualityComparer](./reference-comparer-vector3.md)* [Vector4EqualityComparer](./reference-comparer-vector4.md)
Use these classes to compare two objects of the same type for equality within the range of a given tolerance using [NUnit ](https://github.com/nunit/docs/wiki/Constraints)or [custom constraints](./reference-custom-constraints.md) . Call Instance to apply the default calculation error value to the comparison. To set a specific error value, instantiate a new comparer object using a one argument constructor `ctor(float error)`.
## Static properties
| Syntax | Description || ---------- | ------------------------------------------------------------ || `Instance` | A singleton instance of the comparer with a predefined default error value. |
## Constructors
| Syntax | Description || ------------------- | ------------------------------------------------------------ || `ctor(float error)` | Creates an instance of comparer with a custom error `value.allowedError`. The relative error to be considered while comparing two values. |
## Public methods
| Syntax | Description || ------------------------------------ | ------------------------------------------------------------ || `bool Equals(T expected, T actual);` | Compares the actual and expected objects for equality using a custom comparison mechanism. Returns `true` if expected and actual objects are equal, otherwise it returns `false`. |
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