Dial Size
101" (25 mm) Pocket model
141-3/8" (35 mm) Pocket model
181-3/4" (44 mm) Testing model
202" (50 mm) Testing model
303" (80 mm) Testing model
Product page
NOSHOK
350 Series Testing and General Purpose Bimetal Thermometers with External Reset
The NOSHOK 350 Series Testing and General Purpose Bimetal Thermometers are designed for spot checking and routine testing applications. Featuring a weather-resistant, tamper-proof 304 Stainless Steel case and a friction adjustment nut design that provides easy recalibration and maximum accuracy at a selected range, these thermometers are trusted by service technicians, inspectors, laboratory personnel, and maintenance teams. Available in 1", 1-3/8", 1-3/4", 2", and 3" dial sizes with center back connections, stem lengths from 5" to 18", and a 360° immersion reference groove.
Designed for general purpose testing applications with a weather-resistant, tamper-proof case
Pocket sized model used by inspectors, service, and maintenance personnel for spot checking
Friction adjustment nut design provides easy calibration and maximum accuracy at selected ranges
Accuracy: ±1% full scale (Grade A, ASME B40.3)
Ready for quotationShare your range, connection and case requirement.
Talk to ATHApplicationsSpot checking, laboratory testing, food service & catering, HVAC/R systems, field maintenance, mobile service technicians, and asphalt/soil testing
Dial sizes1" (10-350), 1-3/8" (14-350), 1-3/4" (18-350), 2" (20-350), 3" (30-350)
Case type350 = Center back connection with external reset
Accuracy±1% full scale, Grade A, ASME B40.3
Temperature ranges-100 °F to 1,000 °F (-75 °C to 550 °C) in dual °F/°C, single °F, and single °C scales
Stem lengths5" (050), 8" (080), 12" (120), 18" (180)
Stem diameter0.150" (3.81 mm) 304 Stainless Steel with 360° immersion groove
Wetted materials304 Stainless Steel standard; 316 Stainless Steel optional
RecalibratorExternal reset friction adjustment nut on rear of case
Part number example20 - 350 - 080 - 0/140 F/C - LL
Technical data
Selection and ordering reference
Configure dial size, stem length, temperature range, lens material, and pocket carrying accessories for the NOSHOK 350 Series testing thermometers.
Dial sizes1", 1-3/8", 1-3/4", 2", 3"
Accuracy±1% full scale (ASME B40.3 Grade A)
Case styleCenter Back (350) with External Reset
Stem diameter0.150" (3.81 mm)
RecalibratorExternal Reset Friction Nut
Ranges-100 °F to 1,000 °F (-75 °C to 550 °C)
Case Type
350Center back connection with external reset friction nut
Stem Lengths
0505" (127.0 mm)
0808" (203.2 mm)
12012" (304.8 mm) - 20-350 & 30-350 only
18018" (457.2 mm) - 20-350 & 30-350 only
Dual Scale Temperature Ranges (°F/°C)
-100/100 F/C-100 °F/°C to 100 °F/°C
-40/160 F/C-40 °F/°C to 160 °F/°C
0/140 F/C0 °F/°C to 140 °F/°C
0/180 F/C0 °F/°C to 180 °F/°C
0/220 F/C0 °F/°C to 220 °F/°C
0/250 F/C0 °F/°C to 250 °F/°C
20/240 F/C20 °F/°C to 240 °F/°C
25/125 F/C25 °F/°C to 125 °F/°C
50/300 F/C50 °F/°C to 300 °F/°C
50/400 F/C50 °F/°C to 400 °F/°C
50/500 F/C50 °F/°C to 500 °F/°C
150/750 F/C150 °F/°C to 750 °F/°C
200/1000 F/C200 °F/°C to 1,000 °F/°C
Options & Accessories
PSPocket sheath with clip (5" and 8" stems only)
LLPolycarbonate lens
PLAcrylic lens
TGTempered glass lens
STStainless steel tagging
316316 Stainless steel construction
Part number example
20 - 350 - 080 - 0/140 F/C - LL
20Dial size2" (50 mm)
350Case typeBack conn w/ external reset
080Stem length8" (203.2 mm)
0/140 F/CTemperature range0 to 140 °F/°C dual scale
LLOptionPolycarbonate lens
Technical specifications
Accuracy±1% full scale, Grade A, ASME B40.3
Dial sizes1", 1-3/8", 1-3/4", 2", 3"
Case styleCenter Back (350); 304 SS (316 SS optional)
Stem diameter0.150" (3.81 mm) with 360° immersion mark
RecalibratorExternal Reset friction adjustment nut
Temperature ranges-100 °F to 1,000 °F (-75 °C to 550 °C)
Operating notes
External reset nut allows fast recalibration and zero adjustment in seconds.
Pocket sheath (PS) and pan clips provide flexible handling and safe field transport.
Hermetic seal per ASME B40.3 guarantees dustproof and leakproof operation.
Product Description
The NOSHOK 350 Series provides exceptional portability and rapid thermal response for spot-checking liquids, gases, soils, and equipment surfaces. Built with an all-welded 304 stainless steel case and bezel, it meets ASME B40.3 standards for dustproof and leakproof hermetic sealing.
The friction adjustment nut on the rear allows immediate external recalibration to maintain top accuracy across the primary operating zone. A continuous 360° groove etched into the stem ensures technicians always insert the thermometer to its required minimum immersion depth for reliable readings.
External recalibration reset nut allows rapid zeroing without opening case or violating hermetic seal
Silicone-coated bimetallic coil minimizes pointer flutter and maximizes thermal transfer speed
Adjustable pan clip included on 18-350, 20-350, and 30-350 models with 5" and 8" stems
Pocket sheath with clip (PS) available for easy pocket carrying and sensor protection
Hermetically sealed case prevents internal fogging during sudden hot/cold ambient shifts
Ordering Information
Dial sizes10 = 1", 14 = 1-3/8", 18 = 1-3/4", 20 = 2", 30 = 3"
Case type350 = Center back connection with external reset
Stem lengths050 = 5", 080 = 8", 120 = 12" (20 & 30 models), 180 = 18" (20 & 30 models)
Dual scale ranges (°F/°C)-100/100 F/C, -40/160 F/C, 0/140 F/C, 0/180 F/C, 0/220 F/C, 0/250 F/C, 20/240 F/C, 25/125 F/C, 50/300 F/C, 50/400 F/C, 50/500 F/C, 150/750 F/C, 200/1000 F/C (Not on 1" model)
Single scale rangesSingle °F (-100/100 F to 200/1000 F) and Single °C (-75/175 C to 100/550 C)
Options & AccessoriesPS (Pocket sheath for 5" or 8" stems), LL (Polycarbonate lens), PL (Acrylic lens), TG (Tempered glass lens), ST (Stainless steel tagging), 316 (316 SS construction)
Part Number Example
Standard example20 - 350 - 080 - 0/140 F/C - LL
Dial size20 = 2" (50.8 mm)
Case type350 = Center back connection with external reset
Stem length080 = 8" (203.2 mm)
Temperature range0/140 F/C = 0 °F/°C to 140 °F/°C dual scale
OptionLL = Polycarbonate lens
Product Specifications
Accuracy±1% full scale, Grade A, ASME B40.3
Case & Bezel304 Stainless Steel (316 SS optional); hermetically sealed dustproof & leakproof
Stem diameter0.150" (3.81 mm) with 360° minimum immersion groove
LensConvex Polycarbonate (14-350); Instrument glass on all other models; Polycarbonate (LL), Acrylic (PL), Tempered glass (TG) optional
Dial & PointerAnodized aluminum dial with high-contrast markings; balanced black aluminum pointer
Over-temperature limitsUp to 250°F: 100%; 250°F to 550°F: 50%; 550°F to 1,000°F: continuous to 800°F, intermittent over 800°F
RecalibratorExternal reset friction nut on rear of case
Operating Notes
The external recalibrator nut allows fast calibration verification and field adjustment without opening the case.
Thermometers with ranges 200/1000 °F and 100/550 °C are recommended for intermittent use only above 800 °F (425 °C).
Thermowells are recommended for high pressure, abrasive, and corrosive process applications.
Pocket sheath with clip (PS) provides handy pocket carrying and prevents stem deformation.
Adjustable pan clips allow secure hands-free attachment to vats, open containers, or lab beakers.
360° immersion mark ensures sufficient thermal coupling with measured process media.