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Black steel compound gauge 2-1/2 inch dial 30 to 0 to 300 psi range

Value Brand

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

SKU CH-1C7H-SRXP8

Compound gauge measures vacuum to 300 psi with 2-1/2 inch dial and 1/4 NPT connection

  • Product typeElectronic
  • Measures vacuum to high pressure with a 30" Hg to 300 psi range
  • Reads clearly on a 2-1/2 inch dial with 5 psi and 5 in. Hg graduations
  • Withstands harsh environments from -40 to 150 degrees Fahrenheit
  • Built durable with a steel case, stainless steel tube and polycarbonate lens
  • Connects easily via a 1/4 inch NPT lower mount connection

Ammonia & Refrigerant Compound Gauge

This compound gauge measures vacuum and pressure for ammonia and refrigerant systems. The dial spans 30 inches of mercury vacuum to 300 psi with 5 psi and 5 inches of mercury graduations. A 2-1/2 inch polycarbonate lens protects the black steel case. Accuracy follows a +/-3-2-3 percent grade across the range.

Installation notes

The lower mount uses a 1/4 inch NPT connection for direct threading onto service ports or manifolds. Stainless steel tube and steel socket resist corrosion from ammonia exposure. Apply thread sealant compatible with refrigerants to prevent leaks. Over-tightening can damage the brass seat inside the fitting.

Practical limits

Operating temperature range extends from -40 to 150 degrees Fahrenheit. The +/-3-2-3 accuracy grade means readings near mid-scale are tightest while ends allow wider deviation. Dial diameter of 63 mm limits resolution for fine adjustments. Not suitable for fluids incompatible with stainless steel or polycarbonate.

How it compares

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

Price $16.99
Cheaper than about 81% of the 3,030 comparable items (median $54.99).

Specifications

Product
Brand nameZORO SELECT
Product typeElectronic

Questions about this item

How can I confirm the gauge reads correctly after connecting it to a 1/4" NPT port?

Apply a known vacuum or pressure source and verify the needle moves smoothly across the 30" Hg to 300 psi scale with 5 psi and 5 in. Hg graduations, staying within the +/-3-2-3% accuracy band.

What comes in the box and do I need any extra fittings for the 1/4" NPT lower connection?

The gauge ships as a single unit with a steel case, stainless steel tube, polycarbonate lens and 1/4" NPT lower mount; no adapters or hoses are included so purchase compatible refrigeration hoses separately.

Which dial size and range combination should I choose for ammonia refrigeration work?

This model has a fixed 2-1/2 inch (63 mm) dial and a 30" Hg vacuum to 300 psi compound range, suitable for ammonia systems operating between -40°F and 150°F.

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