Accredited calibration services: 

From -196^oC to 1000^oC   ASTM thermometers, digital thermometers, PRTs, thermocouples, thermistors

Specific Gravity hydrometers. API hydrometers, Baume hydrometers,
Kg/m3 (density) hydrometers, Brix hydrometers, Proof hydrometers

ASTM Class 1 and OIML E-2 and lesser specification stainless steel and brass laboratory weights.  New calibrated weights and re-calibration of weights you currently have.

Thermo-hygrometers, chart recorders, humidity sensors, data-loggers

Burets, pipets, volumetric flasks, graduated cylinders, volumetric glassware

NIST Traceable 

ISO/IEC 17025 Accredited

HYDROMETER

CALIBRATION SERVICES

 CALIBRATION:   The set of operations which establish, under specified conditions, the relationship between values indicated by a measuring instrument ....,     and the corresponding known values of a measurand.   

from ISO Guide 25, ‘definitions’

CALIBRATION consists of the following services:

Pre-calibration examination:

The hydrometer is inspected visually for defects in numbering, graduating, condition, or any obvious physical defects or damage, for any loose ballast material, and the presence and correct placement of a 'scale slippage indicator'.

cALIBRATION:  PER ASTM E-126 

The instrument is then tested in carefully prepared solutions of appropriate media, against  NIST calibrated reference hydrometers at  the required test points (as specified by ASTM or the customer).  At least three readings of the clients instrument (and at least six readings of the NIST reference standard) are taken at each test point.  Readings are resolved under magnification to approximately one-tenth of the smallest scale division and are carefully noted.  We report the mean of a minimum of three closely correlated readings.

 Provision of documentation:

 A Report of Test (sometimes called a Certificate of Calibration) is prepared detailing all pertinent information concerning the test, the observed readings of the instrument, (with corresponding corrections),  and all the required information to convey NIST traceability.   (See photo at right, above)  All certificates are laminated in heavy plastic for protection in the laboratory environment.  

Sample Calibration Report for Hydrometer

 A durable calibration tag is affixed to the hydrometer’s box, or case, indicating the date of most recent calibration and the ‘next due’ date.

Recalibration form and address label to send in your instrument for calibration