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Do not base your order on the picture presented.
Features of the Fisher Scientific Traceable Digital Tachometer:
Touchless and Contact Measurements Model is supplied with four "AA" alkaline 1.5V batteries, rugged ABS case, self-adhesive reflecting tabs, internal light, cone and two wheels (for measuring speeds), and a carrying case.
Certifications: Individually serial-numbered Traceable Certificate is provided from an ISO 17025 calibration laboratory accredited by A2LA*. It indicates traceability to standards provided by NIST*.