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Black steel-cased compound gauge with 3-1/2 inch polycarbonate lens and 1/4 inch NPT lower connection

Value Brand

Value Brand Ammonia & Refrigerant Compound Gauge 30 to 0 to 300 psi 3-1/2 measurement tool

SKU CH-DBWY-7MAXZ

Measures vacuum and pressure for ammonia refrigeration systems with a 3-1/2 inch dial from 30 to 300 psi

  • Product typeElectronic
  • Measures vacuum to 300 psi for ammonia systems
  • 3-1/2 inch dial with 5 psi and 5 inHg graduations
  • Stainless steel tube resists corrosion from refrigerants
  • 1/4 inch NPT lower connection fits standard service ports
  • Accuracy class ±3-2-3 % across full scale

Compound gauge for ammonia and refrigerant systems

This compound gauge measures vacuum and pressure in ammonia and refrigerant circuits. The 3-1/2 inch dial reads from 30 inches of mercury vacuum up to 300 psi with 5 psi and 5 inch mercury graduations. It suits technicians who service industrial refrigeration equipment.

Lower 1/4 inch NPT connection fits standard

The lower mount connection uses 1/4 inch NPT threads common on manifold sets and charging hoses. A steel case and stainless steel tube resist vibration and corrosion in workshop environments. The polycarbonate lens protects the dial from impact and solvent splashes.

Accuracy follows a 3-2-3 percent scale across

The gauge maintains +/-3-2-3 percent accuracy from -40 to 150 degrees Fahrenheit. This specification covers sustained use during long evacuation and charging cycles. Buyers who need a digital readout or data logging should select an electronic instrument instead.

How it compares

Measured against everything we stock in Meters, Testers & Measuring Tools, at today’s prices. Recalculated every night.

Price $24.99
Cheaper than about 71% of the 3,030 comparable items (median $54.99).

Specifications

Product
Brand nameZoro Select
Product typeElectronic

Questions about this item

How long can the gauge handle the 150 °F upper operating temperature before accuracy drifts?

The gauge is rated for continuous use up to 150 °F; beyond that range the +/-3-2-3 % accuracy specification no longer applies.

Does the steel case and polycarbonate lens get hot enough to burn during all-day use on a 150 °F system?

At the maximum 150 °F operating temperature the case and lens will reach system temperature, so protective gloves are recommended for prolonged contact.

What thread sealant or adapter is needed for the 1/4" NPT lower connection?

The 1/4" NPT lower mount requires compatible NPT fittings and thread sealant; no proprietary adapter is included.

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