The following points are helpful when selecting most of measuring devices:
Storage conditions:
Storage temperature and humidity
Working conditions:
Ambient temperature range
Humidity range
Sensitivity:
The minimum unit | step of measurement
Maximum measurement value
Auto-range or manual range:
Auto-range is preferred for non-professionals and for time saving
Resolution:
The number of right digits that can be displayed
Display | Screen type:
- Mon-color
- 7 segment or 15 segment display
- Dot matrix display
- Color display
Display | screen size:
The dimensions of screen
Display graph
Measuring units:
Different measuring units save the time of unit conversion
Response time | Stabilization time:
Time needed to reach the true value.
Hardware overload protection
Accuracy:
Tolerance of measurement +/- as an absolute value of a percentage of full scale reading. How much far the measured value from the actual value.
Precision | Repeat-ability:
How often the reading is repeated or how near the measured values.
Linearity:
How the electric signal is varying with the measure physical property. The higher the linearity, the lower number of points needed for calibration.
Sampling time:
The frequency of updating measurements
Recording/logging
Internal memory size:
Internal memory size for storing measured values
Power source:
- Direct AC current (internal adapter).
- Voltage range and frequency
- AC current with adapter
- Internal battery:
- Battery life
- Maximum battery on time
- Internally-recharged
- Externally recharged
On-screen battery indicator
Ruggedness:
The maximum drop distance after which the device malfunctions or is destroyed
Auto-power off time
Portability
Calibration:
-Has traced calibration certificate from NIST
-Can be calibrated: offsets can be saved in the device
Computer interface connection:
- RS 232
- USB
- HDMI
- Wireless
Computer software
- Device configuration from PC
PC-Online reading | recording
Open channel/not connected probes | sensors detection
Wrong probes | sensors connection detection:
This function is useful in multiple-function measuring devices
Replaceable overload protection
Device sealing | Keypad sealing
Device mounting options:
- Adjustable legs
- Magnetic -mount
- Screw mount
External Vs. internal sensor
Taring | Zeroing
Hold manual Vs. Automatic
Minimum, maximum, average
Counting:
This feature is available in tachometers, and balances
Programmable limit alarm
Buzzer sound quality
Probe length
Probe dimensions
Storage conditions:
Storage temperature and humidity
Working conditions:
Ambient temperature range
Humidity range
Sensitivity:
The minimum unit | step of measurement
Maximum measurement value
Auto-range or manual range:
Auto-range is preferred for non-professionals and for time saving
Resolution:
The number of right digits that can be displayed
Display | Screen type:
- Mon-color
- 7 segment or 15 segment display
- Dot matrix display
- Color display
Display | screen size:
The dimensions of screen
Display graph
Measuring units:
Different measuring units save the time of unit conversion
Response time | Stabilization time:
Time needed to reach the true value.
Hardware overload protection
Accuracy:
Tolerance of measurement +/- as an absolute value of a percentage of full scale reading. How much far the measured value from the actual value.
Precision | Repeat-ability:
How often the reading is repeated or how near the measured values.
Linearity:
How the electric signal is varying with the measure physical property. The higher the linearity, the lower number of points needed for calibration.
Sampling time:
The frequency of updating measurements
Recording/logging
Internal memory size:
Internal memory size for storing measured values
Power source:
- Direct AC current (internal adapter).
- Voltage range and frequency
- AC current with adapter
- Internal battery:
- Battery life
- Maximum battery on time
- Internally-recharged
- Externally recharged
On-screen battery indicator
Ruggedness:
The maximum drop distance after which the device malfunctions or is destroyed
Auto-power off time
Portability
Calibration:
-Has traced calibration certificate from NIST
-Can be calibrated: offsets can be saved in the device
Computer interface connection:
- RS 232
- USB
- HDMI
- Wireless
Computer software
- Device configuration from PC
PC-Online reading | recording
Open channel/not connected probes | sensors detection
Wrong probes | sensors connection detection:
This function is useful in multiple-function measuring devices
Replaceable overload protection
Device sealing | Keypad sealing
Device mounting options:
- Adjustable legs
- Magnetic -mount
- Screw mount
External Vs. internal sensor
Taring | Zeroing
Hold manual Vs. Automatic
Minimum, maximum, average
Counting:
This feature is available in tachometers, and balances
Programmable limit alarm
Buzzer sound quality
Probe length
Probe dimensions
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