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"The importance of TeNS as an analgesic technique .. has been confirmed."
Johnson M I et al (1992) Journal of Orthopaedic Medicine

Max/Min Thermometer

Maximum and Minimum Thermometers tell you what has happened in the greenhouse.

Used by gardeners to check minimum temperatures during the cold months when frost can be a problem and to check the maximum temperature during the daytime.

Highest and lowest temperature recorded by markers moved by two mercury columns. Reset by push button.
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