All supported measurement types are listed below, each with an example of the standard usage for such measurements.
Table 47.1. List of measurement types
Typ  Class  Standardunit  Description 

Acceleration  Zend_Measure_Acceleration  Meter per square second  m/s²

Zend_Measure_Acceleration covers the
physical factor of acceleration.

Angle  Zend_Measure_Angle  Radiant  rad

Zend_Measure_Angle covers angular dimensions.

Area  Zend_Measure_Area  Square meter  m²

Zend_Measure_Area covers square measures. 
Binary  Zend_Measure_Binary  Byte  b

Zend_Measure_Binary covers binary conversions.

Capacitance  Zend_Measure_Capacitance  Farad  F

Zend_Measure_Capacitance covers physical factor of
capacitance.

Cooking volumes  Zend_Measure_Cooking_Volume  Cubic meter  m³

Zend_Measure_Cooking_Volume covers volumes
which are used for cooking or written in cookbooks.

Cooking weights  Zend_Measure_Cooking_Weight  Gram  g

Zend_Measure_Cooking_Weight covers the weights
which are used for cooking or written in cookbooks.

Current  Zend_Measure_Current  Ampere  A

Zend_Measure_Current covers the physical factor of
current.

Density  Zend_Measure_Density  Kilogram per cubic meter  kg/m³

Zend_Measure_Density covers the physical factor of
density.

Energy  Zend_Measure_Energy  Joule  J

Zend_Measure_Energy covers the physical factor of
energy.

Force  Zend_Measure_Force  Newton  N

Zend_Measure_Force covers the physical factor of
force.

Flow (mass)  Zend_Measure_Flow_Mass  Kilogram per second  kg/s

Zend_Measure_Flow_Mass covers the physical factor of
flow rate. The weight of the flowing mass is used as reference point within
this class.

Flow (mole)  Zend_Measure_Flow_Mole  Mole per second  mol/s

Zend_Measure_Flow_Mole covers the physical factor of
flow rate. The density of the flowing mass is used as reference point within
this class.

Flow (volume)  Zend_Measure_Flow_Volume  Cubic meter per second  m³/s

Zend_Measure_Flow_Volume covers the physical factor
of flow rate. The volume of the flowing mass is used as reference point
within this class.

Frequency  Zend_Measure_Frequency  Hertz  Hz

Zend_Measure_Frequency covers the physical factor of
frequency.

Illumination  Zend_Measure_Illumination  Lux  lx

Zend_Measure_Illumination covers the physical factor
of light density.

Length  Zend_Measure_Length  Meter  m

Zend_Measure_Length covers the physical factor of
length.

Lightness  Zend_Measure_Lightness  Candela per square meter  cd/m²

Zend_Measure_Ligntness covers the physical factor of
light energy.

Number  Zend_Measure_Number  Decimal  (10)

Zend_Measure_Number converts between number formats.

Power  Zend_Measure_Power  Watt  W

Zend_Measure_Power covers the physical factor of
power.

Pressure  Zend_Measure_Pressure  Newton per square meter  N/m²

Zend_Measure_Pressure covers the physical factor of
pressure.

Speed  Zend_Measure_Speed  Meter per second  m/s

Zend_Measure_Speed covers the physical factor of
speed.

Temperature  Zend_Measure_Temperature  Kelvin  K

Zend_Measure_Temperature covers the physical factor
of temperature.

Time  Zend_Measure_Time  Second  s

Zend_Measure_Time covers the physical factor of time.

Torque  Zend_Measure_Torque  Newton meter  Nm

Zend_Measure_Torque covers the physical factor of
torque.

Viscosity (dynamic)  Zend_Measure_Viscosity_Dynamic  Kilogram per meter second  kg/ms

Zend_Measure_Viscosity_Dynamic covers the physical
factor of viscosity. The weight of the fluid is used as reference point
within this class.

Viscosity (kinematic)  Zend_Measure_Viscosity_Kinematic  Square meter per second  m²/s

Zend_Measure_Viscosity_Kinematic covers the physical
factor of viscosity. The distance of the flown fluid is used as reference
point within this class.

Volume  Zend_Measure_Volume  Cubic meter  m³

Zend_Measure_Volume covers the physical factor of
volume (content).

Weight  Zend_Measure_Weight  Kilogram  kg

Zend_Measure_Weight covers the physical factor of
weight.

Some popular binary conventions, include terms like kilo, mega, giga, etc. in normal language use imply base 10, such as 1000 or 10³. However, in the binary format for computers these terms have to be seen for a conversion factor of 1024 instead of 1000. To preclude confusions a few years ago the notation BI was introduced. Instead of kilobyte, kibibyte for kilobinarybyte should be used.
In the class BINARY both notations can be found, such as KILOBYTE = 1024  binary
conputer conversion KIBIBYTE = 1024  new notation KILO_BINARY_BYTE = 1024  new
,
or the notation, long format
KILOBYTE_SI = 1000  SI notation for kilo (1000)
. DVDs for example are
marked with the SInotation, but almost all harddisks are marked in computer binary
notation.
The best known number format is the decimal system. Additionally this class supports the octal system, the hexadecimal system, the binary system, the roman number system and some other less popular systems. Note that only the decimal part of numbers is handled. Any fractional part will be stripped.
For the roman number system digits greater 4000 are supported. In reality these digits are shown with a crossbeam on top of the digit. As the crossbeam can not be shown within the computer, an underline has to be used instead of it.
$great = '_X';
$locale = new Zend_Locale('en');
$unit = new Zend_Measure_Number($great,Zend_Measure_Number::ROMAN, $locale);
// convert to the decimal system
echo $unit>convertTo(Zend_Measure_Number::DECIMAL);