HT-1  “Workhorse” Probe for liquids, gases semi-solids. Plastic handle with straight 3” stainless shaft. Not good for surface temps.  Max. Tem. 400°C. Time constant 0.5 secs. 5ft.lead.  Not isolated.
HT-2   As HT-l but with 9" shaft.  

BT-1   For surface temperatures of solids, also for liquids, gases  and semi-solids. Probably our best general purpose probe.
Welded stainless-steel shaft, plastic handle. Tip is 0.028" diameter  bent at right angle to probe to facilitate accurate surface measurements. 5 ft. lead. Immersible. Max tip temp. 240°C. Time constant  

DPT Series   Immersion probes for liquid. #304 stainless steel  welded shaft, wooden handle. 5 ft. lead. Max. Temp. 400°C . Time constant 2 secs. Not isolated. TFT Series - Immersion probes for corrosive liquids. Similar to  DPT series but shaft is Teflon-coated Max. Temp. 150°C  

PT-6  Sensor Six-Pack. For multi-point measurements.
Inexpensive, flexible. Welded sensor beads, tough Kapton insulation, 5 ft. leads. Max. Temp. 400°C. Time constant 0.01 secs. Per package of six. Not isolated.   

GT-1  Air and gas probe. 24" #304 stainless steel shaft, wooden  handle. 5ft. lead. For instant readings of tempe­rature gradients in environmental chambers, freezer boxes, etc. Max Temp. 200°C. Min. Temp. –200°C. Isolated.