YSI Incorporated

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YSI Incorporated (Yellow Springs Instruments) is a scientific instrumentation company that designs and manufactures sensors and systems for environmental monitoring, water quality analysis, and laboratory measurements.

Yellow Springs, Ohio, United States
ysi.com
Owned by Xylem Inc.

About YSI Incorporated

YSI Incorporated, historically known as Yellow Springs Instruments, is a manufacturer of precision scientific instruments and sensors used for environmental monitoring, water quality analysis, life sciences, and industrial process control. Its product lines include water quality sondes, dissolved oxygen meters, laboratory analyzers, and related accessories sold to research labs, utilities, universities, and environmental agencies worldwide. The company operates as a brand within Xylem Inc., a global water technology company, and often appears on invoices and statements simply as “YSI” or “YSI Inc.” ([video.ysi.com](https://video.ysi.com/how-to-order-credit-card?utm_source=openai))

A “mastercard YSI” or “YSI” descriptor on your card statement most commonly reflects a purchase of scientific equipment, sensors, spare parts, calibration standards, or related services made through YSI (online at ysi.com, via phone order, or via a distributor that bills through YSI). In some cases, organizations see YSI charges tied to service contracts, repair work, or recurring orders set up for consumables and replacement components. Because processors and banks often truncate names, the descriptor may appear as just “YSI,” “YSI INC,” or a variation that includes the card network label (e.g., “mastercard YSI”). ([video.ysi.com](https://video.ysi.com/how-to-order-credit-card?utm_source=openai))

If you don’t recognize the charge, first check any recent orders for lab or environmental monitoring equipment, including purchases made by colleagues or authorized users on your account. Look for order confirmations from ysi.com or from your organization’s purchasing system. If questions remain, you can contact YSI directly using the contact details on their website or via the phone/email listed on your invoice; they can typically look up a transaction by date, amount, and last four digits of your card. If the transaction still cannot be matched to a legitimate order, you should then reach out to your bank or card issuer to dispute the charge and request that your card be reissued if fraud is suspected. ([ysi.com](https://ysi.com/customer-support/how-to-order?utm_source=openai))

Bank Statement Variations

1 known variations

These are the raw merchant codes that appear on bank and credit card statements that we've identified as belonging to YSI Incorporated.

  1. mastercard YSI

Frequently Asked Questions

Why do I see a charge from “mastercard YSI” or “YSI INC” on my card statement?

This descriptor usually indicates a purchase processed by YSI Incorporated (Yellow Springs Instruments), such as environmental monitoring instruments, lab analyzers, sensors, or related parts and services purchased through ysi.com, by phone, or via an order that YSI fulfilled and billed directly. Check recent purchases or internal purchase orders for YSI equipment or services to confirm the charge. ([video.ysi.com](https://video.ysi.com/how-to-order-credit-card?utm_source=openai))

What types of purchases typically generate YSI card charges?

Typical YSI charges come from buying instruments (e.g., multiparameter sondes, dissolved oxygen meters), replacement probes, calibration solutions, service contracts, or repair services. Many organizations also use recurring or scheduled orders for consumables, which can produce periodic YSI charges on a corporate card. ([video.ysi.com](https://video.ysi.com/how-to-order-credit-card?utm_source=openai))

Could a YSI charge be related to my organization even if I never personally ordered equipment?

Yes. In universities, labs, utilities, and government agencies, YSI purchases are often made by a central purchasing department or another team member using a shared or departmental card. The descriptor may appear on the main card account even if a different staff member placed the order, so it’s worth checking with colleagues or your purchasing office before assuming the charge is unauthorized. ([muncie.in.gov](https://www.muncie.in.gov/egov/apps/document/center.egov?id=3041&view=item&utm_source=openai))

How can I confirm what exactly was purchased from YSI for this charge?

Search your email and your organization’s procurement system for invoices or order confirmations from YSI or ysi.com on or around the transaction date, then match the amount. If you still can’t identify it, contact YSI customer service with the transaction date, amount, and last four digits of the card; they can usually locate the corresponding order and provide an itemized breakdown. ([ysi.com](https://ysi.com/customer-support/how-to-order?utm_source=openai))

How do I request a refund or resolve a billing error with YSI?

Start by locating your YSI order number or invoice and then contact YSI through the phone or email listed on their “Contact Us” or “How to Order” pages. Explain the issue (duplicate charge, incorrect amount, wrong items, etc.) and provide supporting documentation. If a billing correction or refund is warranted, YSI will typically process it back to the original payment card; if they cannot resolve it, you should then work with your card issuer to dispute the charge. ([ysi.com](https://ysi.com/customer-support/how-to-order?utm_source=openai))

Does YSI use recurring billing or automatic renewals that could explain ongoing charges?

YSI primarily sells equipment and consumables as one-time purchases, but some customers set up recurring orders for calibration standards, consumables, or ongoing service arrangements. These can result in periodic YSI charges at agreed intervals. Review your YSI account or purchasing records to see if any recurring orders or service contracts are active. ([ysi.com](https://ysi.com/customer-support/how-to-order?utm_source=openai))

What should I do if I suspect the YSI charge is fraudulent?

If you cannot match the charge to any YSI order after checking with colleagues and reviewing purchase records, treat it as potentially fraudulent. Contact your bank or card issuer immediately using the number on the back of your card to report the unrecognized transaction, request a card replacement, and, if necessary, file a dispute. You may also ask your bank for a merchant trace report to help clarify the source while the investigation proceeds. ([slash.com](https://www.slash.com/charge-identifier/ysi-incorporated?utm_source=openai))

Can YSI appear on my statement in other forms besides just “YSI” or “YSI INC”?

Yes. Depending on your bank and card network, the descriptor may appear as “YSI INC,” “YSI INC YELLOW SPRINGS OH,” “YSI*” plus an additional text tag, or prefixed by network or processing labels such as “VISA YSI” or “mastercard YSI.” All of these typically reference the same underlying merchant account associated with YSI Incorporated. ([discover.hubpages.com](https://discover.hubpages.com/money/what-is-ysi-inc-charge?utm_source=openai))

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