Hygros H100 Hygrometer - Trekking & Outdoor

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The Hygro H100 humidity meter has a large easy-to-read LCD display, and a unique foam grip to protect against damage. It has an accuracy of 3% and automatic shut off after 8 hours.

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Fisher Pen Refills Fine Green - Fine point, green ink. Pack of 3 refills.

Larvae of the British Ephemeroptera - The larvae (or nymphs) of this family (mayflies) look very similar to the adults. This key is illustrated with line drawings to highlight the differences between the species and is accompanied by extensive notes on their ecology including habitats and feeding behaviour.

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