The reference standards used by our Technicians are maintained and calibrated at regular intervals.  Below are several examples of reference standards used. 

	Fluke 725   Multifunction Process Calibrator  Small, streamlined shape makes it easy to carry. Rugged, reliable design stands up to field use. Easy to read measure/source screen lets you view input and output simultaneously . Measure volts, mA, RTDs, thermocouples, frequency, and ohms to test sensors and transmitters. Source/simulate volts, mA, thermocouples , RTDs, frequency, ohms, and pressure to calibrate transmitters. Measure/source pressure using any of 28 Fluke 700Pxx Pressure Modules. Source mA with simultaneous pressure measurement to conduct valve and I/P tests. Support flow meter testing with frequency and CPM functions. Perform fast linearity tests with auto step and auto ramp features. Power transmitters during test using loop supply with simultaneous mA measurement.
	Fluke 718 Pressure Calibrator Built-in pressure / vacuum hand pump, with vernier and bleed valve. Pressure measurement to 0.05% of full span, using an internal pressure sensor. Pressure measurement to 10,000 psi / 700 bar using any of the Fluke-700Pxx Pressure Modules. Wide range of selectable measurement units for pressure. Current measurement with 0.025% accuracy and 0.001 mA resolution. 24 volt loop power supply. Min-Max Hold functions. Compact size and weight. Simple, push-button user interface. Rugged and reliable, ideal for field use.
	Fluke 700 PO1 Display pressure readings in any of 10 different pressure units you specify in the calibrator setup. Rugged urethane molded case protects the module from rough handling and harsh conditions. Features internal temperature compensation from 0ºC to 50ºC for full-accuracy performance . Includes NIST-traceable calibration certificate. Module can be calibrated locally using the Fluke 700PCK Pressure Calibration Kit, a PC, and a precision pressure source.
	Hart 1521 / 5613 Temperature Probe and Readout Reads PRTs/RTDs to ±0.025°C and thermistors to ±0.005°C. Model 1522 stores multiple data sets totaling 10,000 readings. INFO-CON connector allows interchangeable use of calibrated probes. INFO-CON eliminates errors from programming probe data.
	Vaisala HM 141 RH measurement range 0-100% RH ± 1% accuracy Temperature measurement range -40  - +100 °C Calculates dewpoint, wetbulb, temperature, absolute humidity and mixing ration. Versatile and easy to use Incorporates Vaisala HUMICAPSensor Excellent stability Data collection with serial line download capability NIST traceable
	1433 Decade Box Decade Resistors are primarily intended for precision measurement applications where their excellent accuracy of ±0.01%, stability, and low zero resistance are important. Precision accuracy of +0.01% Resistance range from 10 mW to 11.1111 MW Dust proof, long life switches with solid silver contacts Good frequency characteristics Low temperature coefficient Excellent stability Low zero resistance