Model Type Range Aperture Emissivity Accuracy Notes
M340 Portable -20° C to +150° C 51mm (2") .99 +.005 ±0.2° C Sub-zero, fast clew rage, plate Blackbody source
M310 Portable Amb +5 to +350° C 76mm (3") .99 +.005 ±.25% readling ±1° C General purpose, plate blackbody source
M310HT Portable Amb +5 to +450° C 76mm (3") .99 +.005 ±.25% readling ±1° C General purpose, medium temp., plate blackbody source
M315 Portable Amb +5 to +300° C 76mm (3") .99 +.005 ±.25% readling ±1° C General purpose, 2-piece, plate blackbody source 
M315HT Portable Amb +5 to +450° C 76mm (3") .99 +.005 ±.25% readling ±1° C Medium temp., 2-piece, plate blackbody source
M316 Portable Amb +5 to +300° C 57mm (2.25") .99 +.005 ±.5% readling ±1° C Hand-held source for calibration of fixed mounted IR sources 
M320 Bench Amb +5 to +300° C 76mm (3") .99 +.005 ±.25% readling ±1° C Dual cavity allows for two differenc cal temperatures
M300 Portable/
Bench		 200 to 1150° C 57mm (2.25") .999 ± .0005 ±.25% readling ±1° C Excellent emissivity, large aperature
M305 Portable/
Bench		 100 to 1000° C 25mm (1") .999 ± .0005 ±.25% readling ±1° C Portable 1-piece, high emissivity
M350 Rack  300 to 1100° C 60mm (2.36") +0.995  ±.25% readling ±1° C  
M360 Portable/
Bench		 50 to 1100° C 25mm (1") .999 ± .0005 ±.2% readling ±1° C  2-piece, high emissivity source
M360A Portable/
Bench		 50 to 750° C 25mm (1") .999 ± .0005 ±.05% readling ±1° C Ultra-high precision and accuracy
M335 Bench 300 to 1500° C 16mm (0.65") .99 +.0003  ±.5% readling ±1° C General purpose unit

M330EU

 Bench 300 to 1700° C 25mm (1") .99 +.005 ±.25% readling ±1° C High temperature, quick heat-up time
M385 Bench 5 to 95° C 100mm and 50mm (interchangeable) .9997 (100mm)
.99997 (50mm)		   Ultra-precision, large aperture, low temp
M390 Floor A1=600 to 2300° C  25mm (1") .995 ± .003 ±.25% reading ±1 digit Ultra-fast slew rate and highest temperature
  C-1=600 to 2300° C 25mm (1")    
0.1C Res L=600 to 2300° C 25mm (1")    
2pc S=600 to 2300° C 25mm (1")