Extech Instruments, Waltham, MA, has introduced the Model RPM10 photo/contact tachometer that includes a built-in, noncontact infrared thermometer with laser pointer that provides surface temperature measurement ranging from -4 to 572°F in locations that are unsafe or hard to reach. It features a 6:1 field of view, allowing a 1" spot to be measured at a distance of 6". Combining infrared temperature with RPM measurement, it can be used for evaluating motor performance and detecting bearing or insulation failure. In photo mode, the device uses a laser light source and measures 10 to 99,999 RPM from up to 6.5' from the target. In the contact mode, it measures from 0.5 to 20,000 RPM, while linear surface speed measurements range from 0.2 to 6,560 ft/min, and 0.05 to 1,999.9 m/min. Characters in the display change direction so that readings can be seen regardless of which end of the device is being used. Readings are displayed on an LCD, and memory stores the last maximum and minimum readings. The device is constructed with a double-molded housing, and comes with tips and wheels for RPM or linear surface speed, four 1.5V AA batteries, reflective tape, a rubber boot, and carrying case.
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