PROTMEX PT20C - Moon Phase Display

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(7) Frost alarm function
When the signal sensor of channel 1 is in the environment where the
temperature is less than 3℃ and greater than -2℃, the frost alarm icon " " is
displayed; when the temperature changes outside this range, the icon
disappears.
(8) Heat index and dew point temperature
As shown in the following table, the relationship between the heat index and the
temperature value, and the matters needing attention:
Single press the "HI/DP" key to check the heat index, and then press the key
again to check the dew point temperature;
Temperature in
Fahrenheit
Celsius
Things to note
80 ~ 90°F
27 ~ 32°C
Warning-too long exposure and activity may cause fatigue
90 ~ 105°F
32 ~ 41°C
Serious warning-may cause heat stroke, heat cramps and h
eat exhaustion
105 ~ 130°F
41 ~ 54°C
Danger—very likely to cause heat stroke, heat cramps, and
heat exhaustion; may cause severe heat stroke
Over 130°F
Over 54°C
Extremely dangerous-continuous sun exposure is extremely
likely to cause heat stroke and severe heat stroke