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Delmhorst BD-2100 Digital Moisture Meter with Nist Certification is also Available:
M655N - Delmhorst BD-2100 Digital Moisture Meter with NIST Certification

Features & Applications:

This best-selling, truly versatile, digital unit has three separate scales: wood, sheetrock/gypsum and a relative scale for other building materials. Measures wood moisture content over the range of 6–40%. Reference scale provides relative moisture readings in nonwood materials such as concrete, plaster and insulation. The gypsum scale for sheetrock reads 0.2–50% moisture. Adjustable, audible set point alerts you when a preselected percentage of moisture content has been reached. Green, yellow and red LEDs provide indication of moisture conditions at a glance.

Features:

• Resistance technology recognized as the most accurate method for measuring moisture
• Easy one-hand operation
• Proven microcontroller circuit
• One-year warranty
• Can be used with Standard, Tapped or Deep Wall Probe
• 9V battery and Carrying Case included
• Three scales:
  
  Wood Scale -6% to 40% moisture range. Use for flooring and building material such as wood studs, floor joists, subfloors
  
  Reference Scale - reads from 0 to 100 on a relative basis. Use on non-wood materials such as concrete, plaster, and insulation
  
  Gypsum Scale - 0.2% to 50% moisture range. Use on sheetrock
• Averages up to 50 accumulated readings
• Set-point alerts when pre-selected moisture content is reached
• Connector to attach any available electrode for deep penetration

Applications:

• Wood
• Plaster
• Concrete
• Gypsum
• Paint
• EIFS

Spec Summary:

• 6%-40% moisture range on wood
• 0.2%-6% moisture range on gypsum
• 0 to 100 relative scale for all other non-wood materials
• Size: 7.5"x3"x1.75"
• Weight: 1 lb. 3 oz.
• Battery: 9V alkaline