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Mastech 4.5-Digit True-RMS Autoranging Bench Digital Multimeter

Item no. CSIMS8040

Mastech 4.5-Digit True-RMS Autoranging Bench Digital Multimeter

Item no. CSIMS8040
5 In stock

Mastech 4.5-Digit True-RMS Autoranging Bench Digital Multimeter

This is a Super Value for a Bench Top Digital Multimeter (DMM). True RMS and it's loaded with the features and specifications of higher end units, but at a very modest price. Another example of how Circuit Specialists works hard to find and bring more value to your hard earned dollar!


  • Designed to International safety standard IEC61010-1 CATII 1000V/CATII 600V
  • Digital & Analog display, 22000 count and 44 segment bar graph
  • Autorange and manual range
  • True RMS for AC voltage & Current
  • RS-232 standard interface and PC Windows software
    (Note: a optional USB to RS-232 interface is required for USB connection)
  • Data hold, Max/Min, relative measurement
  • AC voltage, AC current peak measurement
  • AC voltage, AC current with 1KHz low pass filter
  • Voltage/current linear frequency measurement
  • Logic frequency/duty cycle measurement
  • Diode & continuity test
  • Temperature measurement
  • Resistance measurement
  • Capacitance measurement
  • Power source: AC or DC supply
  • Manufacturer: Precision Mastech
  • 1 year limited warranty


  • DC Voltage: 220mV/2.2V/22V/220V/1000V ±0.05%
  • AC voltage TRMS: 220mV/2.2V/22V/220V/700V ±0.6%
  • DC current: 220uA/2200uA/22mA/220mA ±0.2% /10A ±0.5%
  • AC current: 220uA/2200uA/22mA/220mA ±0.3% /10A ±2%
  • Resistance: 220Ω/2.2KΩ/22KΩ/220KΩ/2.2MΩ ±0.3% /22MΩ/220MΩ ±1.0%
  • Capacitance:22n/220n/2.2u/22u ±1.5% /220uF/2200uF/22mF/220mF ±3%
  • Logic Frequency: 220Hz/ 2.2KHz/22KHz/220KHz/2.2M/22M/220M ±0.1%
  • Temperature: -30° - 1000°C ±2°C (-22° - 1832°F)

Users Manual 

Driver CD  ISO format

30 day satisfaction guarantee
Satisfaction Guarantee
Your satisfaction is important to us. If you're not satisfied, return the product within 30 days of purchase for a refund or credit.

Return policy
Free tech support
Free Tech Support
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Some products must be specially ordered, usually resulting in a 1–2 business day delay. Please contact us for an estimated delivery date.