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driven deep into a hard material. For softer materials like soil, paper or powders, readings are
more likely to reflect the average moisture level of the material between its surface and the
penetration depth of the pins (normally far less than 3/8 in.).
The RH650 can store and recall 20 pairs of measurements in its nonvolatile memory. The
instrument also can be set up to sound an alarm if a measured RH or moisture level is above or
below a user-defined setpoint. Finally, the unit can track the maximum or minimum reading of
any parameter over the duration of a measurement session. The unit is powered by an included
"9V" battery.
KEY FEATURES
• Measures 1) ambient temperature, 2) relative humidity (RH), 3) absolute humidity (in
mg/L or g/m
3
level using pinless sensor, 6) absolute moisture level using included pin-type probe,
7) dew point, 8) atmospheric pressure and 9) vapor pressure
• Stores/recalls 20 pairs of readings
• Settable high and low alarms for RH, relative moisture level and absolute moisture
level
• Backlit LCD with 3-digit primary readout + 4-digit secondary readout
• Zero reset in pinless moisture level mode
• Min/Max, Data Hold, and 30-minute Auto Power Off functions
• 1 year limited warranty
SAFETY INSTRUCTIONS
Do not operate the RH650 in the presence of flammable or explosive gases.
The steel pins of the external moisture probe are very sharp. When using the probe, be careful
not to stab yourself or anyone else. Remember to replace the protective cap over the pins when
finished using the probe.
WHAT'S IN THE BOX
The RH650 comes in a soft pouch inside an illustrated box. Also inside the pouch are a
pin-type moisture probe, a sensor protection cap, a "9V" battery and this user's manual.
PRODUCT OVERVIEW
Fig. 1 shows the names and locations of all of the controls, connectors and physical structures of
the RH650. Fig. 2 shows all possible indications on the unit's LCD. Familiarize yourself with the
labels, positions and functions of all buttons and connectors before moving on to the Setup
Instructions and Operating Instructions.
4
), 4) GPP (mixing ratio—in grains per pound or g/kg), 5) relative moisture
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