Recertification Service

Stranaska Scientific provides measurement services for the NIST-traceable recertification of calibration filters designed to test in accordance with USP the four spectrophotometer parameters: resolution, stray light (SRE) properties, wavelength scale accuracy and photometric scale accuracy. Using either routine or advanced calibration methodologies, we can recertify the following types of spectrophotometer filters:


Stray Light
Cutoff Edge Glasses – CRM 600
Chemical Solutions – Potassium Chloride, Sodium Iodide, Sodium Nitrite, and Others

Holmium Oxide Solution – SRM 2034, CRM 100, CA2M 709
Holmium Oxide Glass – CRM 110, CA2M 751
Didymium Oxide Solution
Didymium Oxide Glass – SRM 2013, CRM 150, CA2M 752

Cobalt-Nickel-Nitrate Solution – CRM 200
Potassium Dichromate Solutions – CRM 300
Neutral-Density Glass – SRM 930, SRM 1930, SRM 2930, CRM 400, CA2M 701, CA2M 702, CA2M 703
Metal-on-Quartz – SRM 2031, CRM 500, CA2M 705, CA2M 750, CA2M 772

Note that in addition to the recertification of our own measurement standards (Refmacal and Stranaska brands), we also provide special one-stop measurement services for the recertification of ALL 3rd-party measurement standards (NBS, NIST, STARNA, HELLMA, THERMO, PERKINELMER , PRECISION CELLS and others) for UV/VIS spectrophotometers and microplate readers. Please contact us today for our special contract pricing for exclusive contract recertification of 3rd-party measurement standards.

Telephone 970-282-3840           E-mail [email protected]

Shipping Instructions
Due to the delicate nature of spectrophotometer measurement standard artifacts, Stranaska Scientific recommends that the reference material be adequately packed in and surrounded by a copious amount of packing peanuts or other suitable packing material within a large box of appropriate cubic dimension, preferably with no dimension being less than 8 inches for a single measurement standard. It should be shipped standard overnight for next-day delivery to minimize the risk of damage to any of the filters comprising the measurement standard.

Measurement Services Shipping Address
Stranaska Scientific LLC
4025 Automation Way, Building A
Fort Collins, Colorado 80525 USA

Order Placement and Payment Information
Stranaska’s spectrophotometric measurement services are acquired by providing valid credit card information (VISA, Mastercard, and AMEX) or by issuing an authorized purchase order directly to Stranaska Scientific LLC. The purchase order must clearly include: (i) the product name and number of the measurement standard, (ii) quotation reference number, and (iii) the appropriate measurement services fee. The purchase order must also have explicit billing instruction and accounts payable contact information. Purchase requisitions are not accepted in lieu of authorized purchase orders. International orders and/or drop shipments may require payment in advance.

Purchase Order Address
Stranaska Scientific LLC
Post Office Box 270334
Fort Collins, Colorado 80527-0334