General Tools and Instruments IRT659K - Manual (Page 12)

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Dimensions 5.31 x 1.65 x 6.81 in. (135 x 42 x 173mm)
Weight 6.93 oz. (168g) (without battery)
Power Source (1) “9V” battery (included)
OPERATING & MAINTENANCE TIPS
If the temperature of the IRT’s target is lower than -58°F (-50°C)—the lower
limit of the unit’s measurement range—“OL” will appear on the main readout.
If the temperature of the IRT’s target is higher than 1202°F (650°C)—the upper
limit of the unit’s measurement range—“OH” will appear on the main readout.
The IRTC659K cannot make accurate measurements if there is glass or plastic
between it and the target.
Clean the infrared sensor lens (Fig. 1, Callout B) often—but never use a solvent.
Abrupt temperature changes will cause condensation and possible vapor
penetration. Clean the LCD after the vapor evaporates. Blow off loose particles
with clean, compressed air. Gently brush remaining debris away with a lens hair
brush.
To clean the housing, use a moist cotton swab or wet sponge. Avoid excessive
amounts of water and corrosive gas or liquids.
Remove the battery if you don’t expect to use the IRT for an extended period of
time (months or years).
Do not drop or disassemble the unit or immerse it in water.