1. Dr Ehrenstorfer
Certified Reference Material for:
- Dyes
- Pharmaceutical & Veterinary Products
- PCBs
- PCTs
- PBBs
- PAHs
- US EPA Standard
- Pesticides & their Metabolites
- Pesticide Mixes
2. Hamilton
- Remains stable for a minimum of 1 – 3 years
- Certificate with calibration document
- Expiry date shown on every bottle
- Bottles are permitted to stay open for a total of 60 minutes
- Convenient 250ml or 500ml bottle with built-in calibration compartment
- Economical, only about 15ml of buffer is used per calibration
- Certified pH value from a DKD laboratory
- Traceability to international standards
- Expiration date on the bottle
- Immune to micro-organisms
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